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  1. #1
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    The Yuba Mundo Thread

    Yuba Mundo is now a fully established cargo bike with many owners worldwide. Let's share our experience from riding her, loading her and upgrading her. Here is mine with a fixie in a tow, with a 1940 vintage S&K velocipede, parked at home next to a coat rack, and a detail of her winter shoe. Mine is stock V3 with a front rack, Avid bb5 upgrade and few small things to make the ride for my kids more comfortable. Post pictures of yours, show us the improvements you made on her...
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-img_0118.jpg  

    The Yuba Mundo Thread-img_0117.jpg  

    The Yuba Mundo Thread-img_0121.jpg  

    The Yuba Mundo Thread-img_0100.jpg  

    The Yuba Mundo Thread-img_0094.jpg  

    The Yuba Mundo Thread-img_0097.jpg  

    Last edited by fox1965; 11-12-2011 at 02:15 AM.

  2. #2
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    My Yuba Mundo v4.0



    250 pound passenger, dirt road, passenger movement steers bike... not a good experience for me. 140 pound passenger, dirt road, passenger movement effects bike... this is near maximum comfortable live load. 40 pound passenger, basically no effect on handling or me.

    Mundo is used for hauling and recreational riding, 140 pound passenger (grandson) wants one of his own. From a bulk standpoint, two large square bales of hay is a maximum load (for me) and the weight is a 130 ~ 140 pounds.. (This is a maximum load that I can transport a useful distance.)
    Phil
    SS29er
    Cargo Bike
    Touring / Commuter

  3. #3
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    How do I post Pictures? Whats a url?

  4. #4
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    Love the Yuba in Orange wish the BD came in that color.

  5. #5
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    front rack

    A front rack - a "bread platform" becomes very useful when one carries two kids on the rear rack and needs to pick up a bulky item in the store on the way home. It is easy to attach - just two brackets with 4 screws.
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-img_0122.jpg  

    The Yuba Mundo Thread-img_0131.jpg  


  6. #6
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    Hi Fox, thanks for starting this thread Here are my Mundos, my Orange for daily all around commuter


    Here is my Black Mundo for off-road / single track / fire road use.
    Mid Drive is the future of e-cargo bikes.

  7. #7
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    stand alone kickstand

    Just a short advice to anybody considering Yuba Mundo. Whatever configuration you get, make sure you buy a stand alone kickstand. It gives the bike incredible stability whenever you need it - be it kids or a load of shopping bags.
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-mundo_low-08.jpg  

    The Yuba Mundo Thread-mundo_low-01.jpg  


  8. #8
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    Very nice front rack...

    Where did you source it and what brand?

  9. #9
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    The rack is Yuba's own, available from their website. I bought it directly with my bicycle. Given a standard head tube, it will fit most mountain bikes with 1 1/8" headset.
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-mundo_low-03.jpg  

    Last edited by fox1965; 11-13-2011 at 07:12 AM.

  10. #10
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    Quote Originally Posted by fox1965 View Post
    The rack is Yuba's own, available from their website. I bought it directly with my bicycle. Given a standard head tube, it will fit most mountain bikes with 1 1/8" headset.
    Nice, I really want one of those for my Mundo. After a bit of googling I found out that the rack is made for Yuba by Steco, a Dutch Company.

  11. #11
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    Almost to 10 posts

    After this post I'll be able to post pics!

  12. #12
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    OK Then! Now I can post pics!

    I replaced my 29er w/BOB trailer with a Mundo. The Mundo goes anywhere the old bike did. The Mundo takes "hike-a-bike" to a new level with the rear handlebars to grab hold of. Shown here with about 80lb of camping gear, and a custom four water bottle capacity bar bag system. I run downhill tires with slime because everything has thorns where I live. I did have Hookworms front and back but the wire bead broke on the front tire and it would dismount itself from the rim on occasion, something I'm glad didn't happen while I was bombing down some hill! Anyway I threw a $5 almost bald Kenda Nevegal 2.35 on the front and it grabs the ground a little better than the Hookworm but offers slightly less floatation at low psi. Pretty happy with the combo actualy. I want one of those front racks, just not sure if I want the black one that clamps to head tube or the new one that bolts to the braze-ons. The black one looks more solid to me. I'd also really like to rebuid my bike with a pugsley fork up front and Endomorphs or Black Floyds (fat tires, for those who dont know check out the fatbikes forum) A fat tired Mundo would be the ultimate go anywhere do anything bike. I think you would have to run an internal gear hub because of chain rub. If anyone has done this I'd love to see pics. Also, For anyone who wants to tow a bob trailer, The main tubes at the very back of the bike have an I.D. of 7/8in. so you can put quill stems in them and possibly rig up a spot to put a BOB skewer.
    Last edited by Lone Desert Walker; 11-24-2011 at 07:39 PM.

  13. #13
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    Quote Originally Posted by fox1965 View Post
    A front rack - a "bread platform" becomes very useful when one carries two kids on the rear rack and needs to pick up a bulky item in the store on the way home. It is easy to attach - just two brackets with 4 screws.
    Dude, I would totaly plug those braze-on holes in that cold looking place in the pics. I would take a sharp pencil and jam it into the holes and then snap it off so the tip stays in there and prevents rust. Kidding, I would put some anti seize on some hardware and seal it up. I dont know if the braze-ons are open to the inside of the frame but that would suck if the uncoated inside of the frame started to rust from the inside out. Or someone could have a small flexible tube full of lead bird shot and fill your frame when you were not looking! Nice bike, and totaly dig the front rack.
    Last edited by Lone Desert Walker; 11-23-2011 at 07:31 PM.

  14. #14
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    I, too, ended up with 2.35 downhill tires with slime. For that I played with the chain line a bit. I put a 2 mm washer under the right BB cup and under the freewheel. Still at a small-front large-rear combination, the chain sometimes rubs. I measured other possibilities such as a wider BB spindle or a 6 cog freewheel at the back, but you would not get a chain line for a tire much bigger than 2.3-2,5" at the back. The reason you can get a better chain line with regular bikes is that a tire is right behind the BB, therefore you use the entire space behind it. On Yuba the tire is actually halfway between the BB and the rear axle, therefore on the largest cog on the freewheel you always get the chain closer to the tire. Conclusion: for anything larger, like say 2.5 - 3" you must use an internal gear hub. Then it becomes a matter of strength. I am afraid that 440#-plus-a-rider weight is too much for the hubs on the market. Nu Vinci hub may be capable of that. Tried one on a tandem and works just fine.
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-img_0371.jpg  

    The Yuba Mundo Thread-img_0372.jpg  

    Last edited by fox1965; 11-14-2011 at 11:45 AM.

  15. #15
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    Igh

    I have heard good things about the Sram P5 Cargo hub. Yeah the 2.5 Hookworm hits the chain in the lowest gear but I am in that gear so seldom that for me its not worth worrying about, and the friction/outcome is so minimal that it doesn't matter for me anyway. Whats that thing sticking out in front of your front rotor? Some kind of guard? Has anyone ever unloaded their bike to get through a tuff spot, like a crazy rocky hill and then went back to carry their cargo up to the top? Or maybe across a deep wash? Carrying a Yuba Mundo up hiking trails is realy good exersise and will make you feel "hardcore" or sometimes crazy.

  16. #16
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    It is a Reelight (Shop) - a LED light with a friction free electricity generator. You just attach a pair of magnets on wheel spokes and enough electricity is generated to run a LED light. A small condenser (capacitor) stores small amounts of energy and decharges during stops keeping the light on for several minutes after stopping the bike. Unlike hub dynamo or BB dynamo or tire dynamo there is no contact point. You only have to overcome the force of magnetic field that is negligible compared to air resistance, rolling resistance or bearing friction. No batteries, no upkeep. Always on.
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-img_0373.jpg  

    Last edited by fox1965; 11-15-2011 at 02:39 AM.

  17. #17
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    Cool light.

    Thats a pretty cool light. There is a thread in Fat Bikes about fat tired yuba Mundos, heres the link: http://forums.mtbr.com/fat-bikes/fat-tire-cargo-bike-552339.html#post8635105

  18. #18
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    Here's my v.1.1 Yuba Mundo 1st generation...paid $300 used from a college Student.

    The Yuba Mundo Thread-dsc01281.jpg
    Yeah, well, you know...that's just like your opinion man! -The Dude- 1998
    Trex

  19. #19
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    Just picked up four Yuba's at my shop. We have two Big Dummy's in our fleet currently. Looking forward to doing a full comparo between the two. So far Surly feels faster but flexy. Yuba's an impossible deal to beat. Good to see the cargo stuff catching on.

  20. #20
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    Quote Originally Posted by swpisstol View Post
    Just picked up four Yuba's at my shop. We have two Big Dummy's in our fleet currently. Looking forward to doing a full comparo between the two. So far Surly feels faster but flexy. Yuba's an impossible deal to beat. Good to see the cargo stuff catching on.
    Mr SW...you're right about the Big Dummy being a faster bike, but for the money you really can't beat the Yuba line of bikes. Plus they are doing great things in Africa with them.... the company gives them away to locals, who use them to start-up a delivery business. The following is some information on one the Africa projects, that's on-going....

    Name:  bspw-006-234x178[1].jpg
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    Mundos going to Tanzania -
    Yeah, well, you know...that's just like your opinion man! -The Dude- 1998
    Trex

  21. #21
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    Wrap around deck

    So check this out. I think I am going to replace my side loader boards with one big wrap around board of a little thicker wood. (I think my current boards are 3/8 inch) Then I can attach one of those fork mounts that people put in the back of their truck to the deck for a towing attachment! Also, if the pugsley 135mm adapter is used I can tow my bob trailer. Plus that extra deck space could be useful. If someone is sitting backwards on the rack they can rest their feet or the board. Like I said though, the board will have to be pretty stout. Also a little caution will have to be exercised so that not too much weight is behind the axle, so loading up the bob trailer with a lot of weight will be ify. Usualy the bob trailer puts its weight right over the axle but now the yuba will be taking some tounge weight. Maybe if my wife does not task me over the holiday break I can sneak out to my garage and work on it. Will post pics when its done. Here are my artistic renderings The last one I took from google images and adjusted, so I give the photographer credit whoever they are:



    Last edited by Lone Desert Walker; 11-23-2011 at 12:34 PM.

  22. #22
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    This is a very interesting idea. Just watch out for the curb! One reason why Yuba is designed this way is, that the separation of side loaders at the back of the bike prevents you from getting stuck when you ride down a step, be it a curb or a natural step on a stony trail. I am really interested in your experience with this design.

  23. #23
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    Oh yeah, and check this out!

    If you are pulling a bike with the new "wrap around deck" and towing attachment, someone could conceivably be pedaling that bike thereby making it a trail-a-bike! Here is another crude drawing. So if you had a ton of cargo and didnt think you could make it up a hill on your route you could just recruit a buddy to be a "pusher." Or how about adding another Yuba on the back! If you add a front rack and load it down with rocks you will be able to put more tounge weight on the deck hitch.

  24. #24
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    Oh,yeah, that could be an issue.......

    Quote Originally Posted by fox1965 View Post
    This is a very interesting idea. Just watch out for the curb! One reason why Yuba is designed this way is, that the separation of side loaders at the back of the bike prevents you from getting stuck when you ride down a step, be it a curb or a natural step on a stony trail. I am really interested in your experience with this design.
    I see your point. I think I try to avoid curbs for the most part but when I do go off one I use my brakes so the rear tire goes off in slow-mo and does not slam down. That is when it would totally get hung up. On the other hand if you let the wrap around rest on the curb it would be parked there solid as heck so you could load the bike up. Might actualy be a good urban bike thing for that very reason. Would probably be just as stable or more stable than the stand alone. It would be a good way to stabilize your bike when kids are climbing up on it.
    Now I'm starting to get board here at work and am doing this with paint:

    I guess you could just cut a slot in a 4x8 sheet of plywood and slap that on too!!!!!!!!!!

  25. #25
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    My latest design

    The "Full" "Wrap Around Deck!!!!!!!!!!" Notice the support wires for the front. This takes things to a whole new level!!!!!!!!!


  26. #26
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    OK, I've got a Wrap Around now !!!!

    I had nothing to do today but eat food, drink coffee, and mess around in my garage so I built the Wrap Around. Its got so much deck space its unbelievable. I just need to get one of those fork mounts for the trail-a-bike. I'm going to drill a few smaller holes for tie downs and I still need to get some longer hardware to bolt it down. Its pretty thick wood and it feels super heavy duty. I cant wait to haul some loads with it.











  27. #27
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    I thought the new racks were suppose to attach to the frame?

  28. #28
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    Wrong rack

    Quote Originally Posted by Fresno View Post
    I thought the new racks were suppose to attach to the frame?
    The new one from Yuba does attach to the frame via the braze-ons in the pic. The black rack above is the one made in denmark available for like $35. the one from yuba is like $125 I think. I think I like the Dannish one myself.

  29. #29
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    The modified wood racks looks great.

  30. #30
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    Merry Xmas!

    This is how I got our tree home!
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-img_0426.jpg  

    The Yuba Mundo Thread-img_0427.jpg  


  31. #31
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    Has anyone tried to put 29" wheels on their Yuba Mundo?
    Has anyone tried one of the Surly's wide tires/wheels?

  32. #32
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    Soon, very soon.

    I am getting closer to getting some fatties under my YuMu. I want to do a 135mm non offset pug fork and run interchangeable front and rear wheels, each built with no dish, 48 spokes and free-free hubs with single speed freewheels. Four gears baby! You have to pull over and flip or swap tires around to change gears!!!!! A four option single speed fat tire YuMu will be an unstoppable expedition machine. I will have to run a chain tensioner though, but they are simple and strong and its not unthinkable to carry a spare on long desert crossings. Strong, durable, simple. There is 4in of clearance in the back so I think endos will run fine. I would like to see some pics but I might just have to measure an endo on a 65mm LM to see what the width is. I might end up running some 44mm snowcats or something to get the tires to clear.

  33. #33
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    How about using a gear hub at the back and having a 135mm non offset in the front? That way you will have whatever amount of gear the rear hub has and no chainline problems plus a spare wheel in the front in case rear hub fails. Just a suggestion. (Cause changing or flipping wheels on loaded YuMu can be a challenge.)

  34. #34
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    Like an alfine 8?

    Yeah, maybe that would be optimal. It would not be as hard core but maybe that is a good thing! I like the way you think. It would be a real pain to switch wheels if I was loaded, especially with my wrap-around deck which is always getting in my way. I guess the only issue is finding the right crank set so that the single chain ring is set far enough out that the chain line is good. looking at the surly website I see that the endos are 3.7 in on 65mm rims so there should not be a problem when running slightly more narrow rims. Theoretically they will run fine on 65mm but will have only 1.5mm of clearance on either side, so if a rim gets out of true or conditions are muddy I think I would want a little more margin than that. I am thinking 30mm to 50mm rims will be better. Of course with a more narrow rim the handling might get squirmy at low psi. I bet the 44mm snowcat rims would do well. And the more narrow the rim the greater the diameter of the tire so there is some playing around to do here. I do not know what the max diameter would be. Just looking at the bike I would say you could squeeze in a 700c wheel with conservatively sized tires.
    Last edited by Lone Desert Walker; 01-06-2012 at 10:39 PM.

  35. #35
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    I thing the best crank is one with a good old square taper bottom bracket. That way you can choose any chainline you want.

  36. #36
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    Hi! I'm new here, just bought my Mundo home a few days ago. Love the thread and the different pics and projects, very inspiring!

    I need a little advice and I'm hoping you folks can give me an idea- Firstly everywhere I go my 20 month old will be in tow. Ive ordered a peanut seat but have to wait until the end of feb for it to be in stock.
    I would like my son to be set back on the platform a little so he's not squished against me and also so I can still swing my leg over the back. This is important because I don't feel very stable putting it over the cross bar without his weight added, so I think once he's loaded it could be potentially dangerous for me to put my leg over (I'm quite short and out of shape). Secondly I'm getting two of the Go-Getters and want to use them too...but I've heard the panniers and the seat are hard to utilize together. So heres my ideas and I would appreciate other Mundoer's views, thank you!

    1- Could I potentially extend the deck out the rear on each side to incorporate the panniers being placed back and extended past the rear a little? I don't intend on carrying huge loads in them or extremely heavy stuff and won't be going off curbs as my little one would get whiplash. I thought I could rig something with thinner PVC pipe and wrap it around from one side to the other. It would be easier if I had the seat and the bags in front of me, but I don't as they are both being ordered.

    2- I considered raising the baby seat so his leg holders do not hang so low on the sides but was concerned raising him wold throw of the center of gravity making it harder to ride.

    I totally realize its a long stretch that anyone here has dealt with this. I also cant upload pics yet so cant really show the complications Im dealing with. At the moment Im trying to rig a trailer up to the bike so I can get cycling, but that defeats the whole object of getting a cargo bike for me. My main buying point with the mundo was a baby seat and panniers- now that is looking a little tough to utilize I'm determined to solve the problem.

  37. #37
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    Long tail bikes are excellent for transporting kids - the long wheel base gives a much more stable ride.

    I don't have any experience of the Mundo, but use an Xtracycle to transport two kids and believe that the experience is the same for both bikes.

    Putting any of the kids behind the center of the rear wheel affects handling negatively. I also found that raising the child seat by only a few centimeters, say an inch, affected the handling. Because of this I have the child seat of the second kid as close to the deck as possible and just above the center of the rear wheel. The older kid sits on her own, between me and the youngest kid.

    The child seat reduces the amount of other stuff you can carry, but it's possible to find room in the panniers infront and behind the child seat. I think that a good alternative is a front rack because it balances the bike.

    Getting on the bike I use the kick stand, raising it only after having mounted the bike. I find getting of the bike is always easier.

    Having said that, half the fun of having a cargo-bike is modifying it to suit you own needs!

  38. #38
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    I've tried an Endo on the rear of my Mundo V3. It fit, but with barely any clearance for mud, wobble, or snow. I actually have a Pugsley fork laying around that was supposed to be used to make the Mundo fat. Just haven't gotten around to it. Too many other projects and trails to ride.
    baker

  39. #39
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    Regarding carrying kids...I've carried my preschooler and elementary kids around a bit on my Mundo. Initially, I thought I'd get a "car seat" type thing for the kids, but I didn't.

    I put a handlebar on the back for the kids to hang onto. If there is a second kid, they have to hang onto the first and/or the rack.

    To keep their feet outta the wheel, I installed a lower mounted rail and put grocery panniers on that. Then the kids put their feet in the grocery panniers. Works fine and I can throw their backpacks, etc in the panniers, too.

    Stability while getting on/off is definitely an issue. I installed a two legged kickstand, which helped immensely. I still have to be careful, especially on dirt roads (which is pretty much the only place I ride the Mundo). Also, the leg swing to mount/dismount is an issue. After nearly taking out the kids a couple times, I started mounting differently (lifting the leg over the top-tube).

    As my kids got bigger, I actually installed an electric motor front wheel and a couple RC car batteries to drive it. Pretty fun and I can revert to pedal power very easily.

    Here are a couple links that show my Mundo:

    Monumentally Afflicted: Yuba Mundo...Schwing!!!

    Monumentally Afflicted: Yuba Mundo V3 Upgrades

    The Electric Pig
    baker

  40. #40
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    thanks folks for the ideas- if you go to my blog spot and look on the right there is a link for my DIY kids seat.


    You Ain't Got Jack

    Last edited by YouAin'tGotJack; 01-28-2012 at 11:13 AM.

  41. #41
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    heres pics- slowly figuring this site out
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-3rd-trip-002.jpg  

    The Yuba Mundo Thread-3rd-trip-007.jpg  

    The Yuba Mundo Thread-first-trip-diy-bike-seat.jpg  


  42. #42
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    The seat is set back just far enough that I can swing my leg on and off which is SO much easier than trying to step over the bar for a shorty like me. I have a pair of wheel skirts that I need to attach to, probably get to it today.

    I'm also waiting for a double kickstand- does anyone here know if I can use the double kickstand that E-bikes sells rather than the Yuba one and if they are of similar construction. I hate to have to wait until March for the Yuba stand.

  43. #43
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    Quote Originally Posted by Lone Desert Walker View Post
    Yeah, maybe that would be optimal. It would not be as hard core but maybe that is a good thing! I like the way you think. It would be a real pain to switch wheels if I was loaded, especially with my wrap-around deck which is always getting in my way. I guess the only issue is finding the right crank set so that the single chain ring is set far enough out that the chain line is good. looking at the surly website I see that the endos are 3.7 in on 65mm rims so there should not be a problem when running slightly more narrow rims. Theoretically they will run fine on 65mm but will have only 1.5mm of clearance on either side, so if a rim gets out of true or conditions are muddy I think I would want a little more margin than that. I am thinking 30mm to 50mm rims will be better. Of course with a more narrow rim the handling might get squirmy at low psi. I bet the 44mm snowcat rims would do well. And the more narrow the rim the greater the diameter of the tire so there is some playing around to do here. I do not know what the max diameter would be. Just looking at the bike I would say you could squeeze in a 700c wheel with conservatively sized tires.
    If that frame has 4 inches of clearance in the back it is your civil duty to the world of bike nerds to make it an Alfine Fattie. SS would just be a dumb idea on that machine.
    I just built up a front wheel with a Echo Trials 44mm rim from webcyclery and an Endo measures to either 84 or 86 mm (can't remember). For a little while I had the Endo on a 29 mm rim.... that was a little squirrely and lost a lot of tire volume - not all the tread would hit the ground even at low pressure.
    I'd say go for the 44mm rims and don't look back. Mud clearance is a good thing.



  44. #44
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    I looked at those awhile back. I'm very suspicious of the 14mm rear axle. Suspicious that its a p.o.s. that will be hard to replace. 14mm to 10mm converters are an ok workaround, but I still would prefer a frame designed to take conventional quick-release 10mm axles.

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    Dude,

    Half the bmx bikes out there have 14mm axles, they are just thicker axles, whats to be suspicious about? The 14mm dropouts are more universal and adaptable than any other dropouts. It is not a problem to run any axle in the mundo frame.

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    The Mundo has a 400 lb cargo rating... PLUS the rider! You don't get there with a hollow 10 mm axle. We bent the Phil Wood axle on our tandem, no luggage, my stoker is fairly petit, and yells at me if I do anything that SHOULD bend an axle. That 14mm hunk of solid steel is very reassuring when the Mundo is loaded up.

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    Quote Originally Posted by Lone Desert Walker View Post
    Half the bmx bikes out there have 14mm axles, they are just thicker axles, whats to be suspicious about? The 14mm dropouts are more universal and adaptable than any other dropouts. It is not a problem to run any axle in the mundo frame.
    Quote Originally Posted by gumby_kevbo View Post
    The Mundo has a 400 lb cargo rating... PLUS the rider! You don't get there with a hollow 10 mm axle. We bent the Phil Wood axle on our tandem, no luggage, my stoker is fairly petit, and yells at me if I do anything that SHOULD bend an axle. That 14mm hunk of solid steel is very reassuring when the Mundo is loaded up.
    a lot of bmx folks have moved away from 14mm axles, but yes they still are used. bmx rear uses 110mm o.l.d. hubs, and you wouldn't want to lace that to a 26" rim... too narrow of flange spacing, not to mention unavailability of hub with 8sp freehub body.

    Many 14mm axles use low quality steel. a 10mm axle with a nice heat treatment and the right material can be far stronger than a crappy 14mm axle. I've seen this over and over again on bmx bikes. My perspective comes from 10 years of serious riding semi-professionally (getting payed, but not living off it) and working at a dozen bike shops (I moved around a lot while going to college).

    Most people are running quick release on their big dummies and tandems without any problems. I've done some tandem touring with quick release front and rear with no problems.

    semi-proprietary components are a huge pain in the ass. If its not broke, don't create a new part that breaks it!

    axle converters get smooshed and gummed up over time. Say you buy a new hub after the cheapo one it (I'm assuming its low quality since this is a relatively cheap bike and we are speaking of the bicycle industry) comes with fails after only a few thousand miles. Perhaps you buy a nice solid axle to replace the qr axle. You install it with some 14mm to 10mm adapter and ride for awhile. Then one day you want to overhaul the hub or tighten a loose cone or locknut, but that damn adapters bunged up the threads on the axle and you can't get the locknut and cones off without stripping them or trying to find a die to clean up the threads. This kind of ordeal has plagued bmx riders for years. Why bring their problems to the bigger wheeled bicycle world?


    edit: and i also wanted to mention that one of the great things about 10mm dropouts is that you can file them to accommodate a 14mm axle without much trouble (assuming the dropout design leaves enough material remaining). adding material to go the other way, now that's tricky.

  48. #48
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    Good points here.

    Quote Originally Posted by PretendGentleman View Post
    a lot of bmx folks have moved away from 14mm axles, but yes they still are used. bmx rear uses 110mm o.l.d. hubs, and you wouldn't want to lace that to a 26" rim... too narrow of flange spacing, not to mention unavailability of hub with 8sp freehub body.

    Many 14mm axles use low quality steel. a 10mm axle with a nice heat treatment and the right material can be far stronger than a crappy 14mm axle. I've seen this over and over again on bmx bikes. My perspective comes from 10 years of serious riding semi-professionally (getting payed, but not living off it) and working at a dozen bike shops (I moved around a lot while going to college).

    Most people are running quick release on their big dummies and tandems without any problems. I've done some tandem touring with quick release front and rear with no problems.

    semi-proprietary components are a huge pain in the ass. If its not broke, don't create a new part that breaks it!

    axle converters get smooshed and gummed up over time. Say you buy a new hub after the cheapo one it (I'm assuming its low quality since this is a relatively cheap bike and we are speaking of the bicycle industry) comes with fails after only a few thousand miles. Perhaps you buy a nice solid axle to replace the qr axle. You install it with some 14mm to 10mm adapter and ride for awhile. Then one day you want to overhaul the hub or tighten a loose cone or locknut, but that damn adapters bunged up the threads on the axle and you can't get the locknut and cones off without stripping them or trying to find a die to clean up the threads. This kind of ordeal has plagued bmx riders for years. Why bring their problems to the bigger wheeled bicycle world?


    edit: and i also wanted to mention that one of the great things about 10mm dropouts is that you can file them to accommodate a 14mm axle without much trouble (assuming the dropout design leaves enough material remaining). adding material to go the other way, now that's tricky.
    I never thought about steel quality, I hope the yuba axles are quality. If they are not they could be replaced with quality ones, and quality 14mm axles will be stronger than quality 10mm axles. I think all those people running hollow 10mm axles on their cargo bikes are not loading them up like you could with a solid high quality 14mm axle. The fact is thicker steel (steel quality being equal) is stronger, so if you want a serious cargo bike 14mm might be the way to go. If you never plan to use it to its full capacity go with whatever.

  49. #49
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    Quote Originally Posted by Lone Desert Walker View Post
    I never thought about steel quality, I hope the yuba axles are quality. If they are not they could be replaced with quality ones, and quality 14mm axles will be stronger than quality 10mm axles. I think all those people running hollow 10mm axles on their cargo bikes are not loading them up like you could with a solid high quality 14mm axle. The fact is thicker steel (steel quality being equal) is stronger, so if you want a serious cargo bike 14mm might be the way to go. If you never plan to use it to its full capacity go with whatever.
    All this is true.

    However it may be very difficult to find another axle(of higher quality), let alone a replacement axle. I've seen 12 year old kids bend solid 14mm axles, and I've put some 10mm axle wheels through the ringer with no bending.

    If the hub is unsealed, there will be no problem replacing the axle, but good luck finding a nice one. Suzue replacement axles are an option, but they're probably rare now.

    If the hub is sealed, then you have to find an axle with shoulders that have the same spacing. I can pretty much guarantee you that you will not find this, as no bmx hub will have shoulders for the inner race of the bearings in a comparable location due to narrower old.

    So the idea is fantastic in the abstract, but the real-life trade-offs make it highly questionable.

  50. #50
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    This is a revelation!

    We now have a picture of a Yuba with Endomorphs on it, yes thats right, photographic evidence of a fat yuba!!!!!!!!!! Fat rims

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    Fox asked for some info......

    Hi Guys,

    In response to Fox, who asked for some info on my bike, I'm going to post up the Q & A's here as well.

    There are a couple of other little things, namely the Rohloff hub I'm using is one that I've owned for many many years and that unit has a QR axle, not ideal but good enough for evaluation purposes. This bike, at this stage, is an experiment, and to keep costs under control in case the whole thing goes pear shaped I'm using what I have. However....I suspect this whole shebang will work.... ("live in hope, die in despair" as they say) so I'm researching my avenues for components that are better suited to a fat cargo bike. One of these will be a solid axle, 48 spoke Rohloff laced into a Wienmann / US Chopper 26 x 4" double walled rim. The boys over on the fat bike forum have been feeding me info on this, thanks guys. (they know who they are ) And on advice from said Fat Bikers, I'm already trying to source a different Sus shock for the front.

    The bike, in it's interim state when it leaves the LBS in a few weeks will carry me on a maiden voyage of approx 800 Km's over a mixed bag of bush, very sandy double track, across a dry salt lake, hard pack dirt road and finally 80 odd Km's of tar. On this ride it'll carry aprox 40Kg of water, me , 90 Kg, a heap of crud I'll likely not use, ~30 Kg. a total of 160 Kg.

    OK, below are the Q & A's posed by Fox, the questions have the nubers beside them, the answers don't.

    Al

    PS I'll put a pic at the bottom. It was taken with my phone so it's not the best


    fox1965, Mate, this is turning into a Tome....but here you go, my answers will be under your questions.

    1. Is your blue bike Yuba Mundo or is it a knock-off version? There are several Yuba Mundo owners out there who are trying a fat bike conversion of Yuba and your input is very precious.

    I strongly suspect it's a Chinese knock off. There are subtle differences. eg the tube from the bottom bracket to the rear forks is a little shorter and the rear axle mounts are a bit different. It's built of high tensile steel I'm told.

    2. Doesn't your chain rub the rear wheel? This was my problem with traditional derailers.

    When I picked the bike up I put the Endo's straight on the rear and rode it basically standard. There were two mudgaurd mounts that I had to cut off with a hacksaw but that was all.
    I had chain rub if I tried to use the low end gears in the low ring on the front. As I'm taking the cluster off and replacing it with a Rohloff, I'm hoping this won't be an issue.

    3. How do you brake at the back of your bike? I do not see any caliper or disc.

    I had to remove the caliper because, as you'll likely realise, it hadn't a snowflakes hope in hell of getting itself around 3.8" of tyre. So for the 15 Km ride to the bike shop I simply relied upon, a) the front brake and b) running into either a pole, car or pedestian to stop.....I've discovered it's a great way to meet women as one can then visit them in hospital for some time thereafter "meeting" them....
    Whilst it's at the LBS, which is not so 'Local' as it's 3700 Km's away it's getting a disk brake tab grafted onto the rear. I'll run a 203mm rotor on the Rohloff.

    4. Is the rear tire on the original 30mm Yuba rim with 48 spokes? How does the wide tire sit on a rim this "narrow".

    Yes, for the first ride the original rim of 30mm width was used. The Endo sat well on the rim, but I carried no weight. I've used Endos on 47 mm rims extensively to enable me to change to road tyres once I hit a long patch of tar on my rides. I've never encountered any problems with that combo. Of course, one doesn't quite get the spread one would on a wider rim.

    All of us Yuba Mundo riders are watching your progress with excitement!

    Fox
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-longtail.jpg  


  52. #52
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    Easily fitting 2 kids on the Mundo:


    IMG_2389 by guruatma, on Flickr
    功夫大师喜欢骑着他的自行车在山上。

  53. #53
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    looks great!

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    Better not get going to fast with the full wrap you might just fly away!

  55. #55
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    Yuba!

    Love it.
    Everyone should have one of these. It even makes going to Costco fun.

    We added a Montague Octagon quick release adjustable stem to ours since my wife is 5'6" and I'm 6'2". The rest of the setup is from their catalog.
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-yuba-costco.jpg  

    The Yuba Mundo Thread-yuba-boys2.jpg  

    Last edited by chongoman; 04-06-2012 at 08:55 AM.

  56. #56
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    Quote Originally Posted by chongoman View Post
    Love it.
    Everyone should have one of these. It even makes going to Costco fun.

    We added a Montague Octagon quick release adjustable stem to ours since my wife is 5'6" and I'm 6'2". The rest of the setup is from their catalog.
    AWESOME- that looks a similar set-up to my bike only I'd have size 5 diapers on the rack for my boy!

  57. #57
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    I cant control it! Its lifting off!

    Quote Originally Posted by morganxc View Post
    Better not get going to fast with the full wrap you might just fly away!
    Wow, you just gave me some really dangerous ideas. If I make a wrap around deck with adjustable tilt and pitch controls on the handle bar and install a rudder........
    This link has a picture that is relevant Skycycle(s) - Bike Hugger

  58. #58
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    What is that on both of these just in front of the rear wheel?

    Quote Originally Posted by Fatboy Joe View Post
    Hi Fox, thanks for starting this thread Here are my Mundos, my Orange for daily all around commuter


    Here is my Black Mundo for off-road / single track / fire road use.

  59. #59
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    Quote Originally Posted by Tom93R1 View Post
    What is that on both of these just in front of the rear wheel?
    It's an electric assist system Helps me get through the steep stuff while loaded with cargo, or with my kids.
    Mid Drive is the future of e-cargo bikes.

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    How do you like the Maxxis Hookworms on your Yuba?

  61. #61
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    Quote Originally Posted by owenfinn View Post
    How do you like the Maxxis Hookworms on your Yuba?
    They are great. No flats since I put them on. They are 2.5" wide,which makes them stable at high speed (38mph). They are heavy though, compared to the Schwalbe Marathons and Big Apple.
    Mid Drive is the future of e-cargo bikes.

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    Quote Originally Posted by Fatboy Joe View Post
    They are great. No flats since I put them on. They are 2.5" wide,which makes them stable at high speed (38mph). They are heavy though, compared to the Schwalbe Marathons and Big Apple.
    Plus they just look awesome. Not really concerned about weight or speed, but durability and ride quality with a lot of weight on the bike is most important. Are those the stock fenders?

  63. #63
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    Quote Originally Posted by owenfinn View Post
    Plus they just look awesome. Not really concerned about weight or speed, but durability and ride quality with a lot of weight on the bike is most important. Are those the stock fenders?
    Yes,stock fenders.
    Mid Drive is the future of e-cargo bikes.

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    Well then - I think I am going to place my order for a set of Hookworms today. Thanks for the info!

    BTW - since I am ordering stuff, anyone have any suggestions on a good replacement seatpost for the Yuba? The stock seatpost I have is now pretty beaten up (scratched up and stripped of paint).

  65. #65
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    Replace?

    If it has little burs on it you can use a fine file or some steel wool. When ever I get a new bike or put one together I always feel inside of the seat tube where the clamp goes because I have learned that sometimes there is a little bur there from the manufacturing process and it ends up scratching the hell out of the seat post, usualy resulting in a zig-zag pattern up one side. I use a little round file to clean up the area and then of course grease the seat post. I bet someone out there could really use your used seat post since posts that long are kind of hard to come by. They must be like 800mm or something. You could use a sharpe to hide the scratches if you were not to picky. I think cargo bikes look better with a few scatches. Anyway you can just order a new one from Yuba.

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    ... and if we just ... Its now ridable..... (new link to pics added.....15/4/12 )

    Guys, I've all but got the "Yuba look alike" together. Rode it this arvo through some very loose dry sand and it goes really well. It was empty though. Tomorrow I'll put some weight on the old girl and see how it goes.

    Pictures of all the relevant bits will hopefully posted tomorrow evening.

    A bit of a run down;

    Back rim is a rolling Daryl, 100mm, both an Endo and a Nate fit into the allotted space, albeit very snug. OK for sand, not so good for clay type mud, but then what is? 32 spokes laced to a Rohloff hub with a 15 tooth sprocket. 203 mm rotor with an Avid Elixir 1 stopper. (Must say it works really well)

    Front rim is an old double Sun with an Endo. 32 spokes. Forks are now WB 200 Groove.203 rotor with an old Hayes Niner stopper. (Not as good as the Avid but the Avid line is way too short. Will get a kit to lengthen it off the net as I couldn't find one in town)

    Crank set is a Shimano Saint with a 40T and 35T rings. The rings are el cheapo units at the moment. I'll have some good ones machined up in the USA if this goes well. Chain is a 9 speed SRAM unit, 2nd from the top of the line. (can't remember the name....) Will be trying a Ĺ x 1/8 chain but not sure how the Rohloff will like it as a 9 speed is reconmended.

    Headset is...well, pretty different, I have 2 BBB 70mm steerer tube extenders on there at the moment and a 50 degree adjustable el cheapo head set. While I've been in town building this up, 2 Gazelle Shuttles, different extension lengths, have arrived at home. I'm hoping these will slide into the steerer. They are quill units. I've worked out how to get and keep preload on the A head unit.

    Seat is a Brooks B67, (I think, I've owned it so long I can't remember....), and stem is a KS 27.2 remote dropper. This is my problem child at the moment as the seat tube is a queer size. I'm having to use a shim but itís not been 100% successful yet and occasionally the whole post drops whilst riding.

    I'm going to put on a wireless odo tomorrow to keep track of the K's

    That's about it for now.
    Al

    Here's the link to the pics, there are 2 lots.

    It's now ridable (with pics)
    Last edited by alanm; 04-15-2012 at 04:21 AM. Reason: Added info

  67. #67
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    I'm LOVING this thread! I'm REALLY hoping to be ordering myself a Mundo in the next week or so (fingers,arms,toes,legs AND eyes crossed )
    '11 Origin 8 700CX
    '14 Surly Troll

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    I'm looking at getting a frame when yuba gets more at the end of May. I really wish the rear wheel had a freehub rather than freewheel, as this is the main thing deterring me from getting the complete (more so than my skepticism about the quality of the 14mm axle hubs).

    disc tabs are on their frame and fork now. I'll probably use my spare big dummy fork, as I'm not particularly interested in running a threaded headset and stem.

    They've got a nice EP option, which I appreciate greatly. I wish Surly would do EP's.

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    Current production has a thread less 1-1/8" steerer.

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    Thanx to Lone Desert Walker and AlanM I am slowly but surely getting to a goal of a fat tire Yuba Mundo. Will post a better picture after I am done with it. The fork is an older Surly Pugsley. Rims are original Mundo 27mm.
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-img_0605.jpg  


  71. #71
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    Man that looks killer cool!!!
    '11 Origin 8 700CX
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  72. #72
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    Fox, That rocks

    How much room do you have between the tyre and the chain stays?

    How much room do you have between the tyre and the seat stays?

    How much clearance is there for the tyre at the chainstay brace?

    How much clearance is there for the tyre at the seatstay brace?

    Do you have any issues with chain rub on the tyre?

    Cheers,
    Al

  73. #73
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    This is awsome

    Things are really coming together in the fat yuba world. Black frame is nice. Are you going single speed or derailleur? I dare you to go fixed! 22 tooth front 22 tooth rear, one to one! Also no brakes to keep it light, you can skid-stop. Can we see some pics of rear tire clearance? Is that a non offset 100mm Pug fork?

  74. #74
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    For those that are interested yesterday I spent a day in the shed modding the rear end of my "Lookalike Yuba" to take a BFL on the rear, screaming success even if I say so myself...... I had to knock up a dimpling tool (patent pending in all 3rd world countries!! ) to dimple the seat stays. It worked well but my Butane gas bottle couldn't really deliver enough heat to get the full area cherry red and consequently one side is still a little tight for clearence, so I'm going to use the oxy at work to finish it off. Bit of a chain suck issue but once again, a patent is out on that fix as well, another screamin' success story for the great Aussie shed.....
    I also fitted a Nate to the front, it's on a Double Wide Sun rim and fits in neatly because of my front rack mounts. Without the front rack mounts I could go to possably an 80mm rim, I'll be trying this next but I have to fit different racks first.Fork is the WB Groove 200, lack of lockout may prove to be a bit of an issue but it soaks up the bumps and feels good with 20Kg of gear on it. I need wider bars though!

    I took the bike for a ride last Thursday, it was meant to be a 4 day, 200Km bush trip and it's maiden voyage. I had it loaded to the hilt including 40Kg of water (40Liters) in total cargo weighed 70Kg and I weigh 95Kg. It rode really well on both the tar and loose sandy dirt, BUT the Rohloff hub fell to bits, 8 screws holding the hub together fell out, very sus really. My local Rohloff dealer had never heard of it happening before,it looked fine prior to leaving, still I wired it up with tie wire and rode it back. Luckily I had only done 20 K's when I realized something was wrong. I had it in a workshop and they changed the rotor, no reason to touch said screws but I can't help but thinking.......

    Here's a pic of the great Aussie shed...... meanwhile, other pics will hopefully follow tomorrow.

    Al
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-2012-04-30_09-56-08_930-rev-1.jpg  

    Last edited by alanm; 04-30-2012 at 05:20 AM. Reason: Added info

  75. #75
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    Dude, you really need to sweep your shop floor! It looks like you have not ever swept it Just kidding bro that looks like a cool shed. Do you know if your yuba is hi ten steel or 4130? Is the bfl going on a Marge or something wider? Thats pretty crazy that Rohloff comming apart like that. I have always heard good things about those hubs, but they have a ton of moving parts and if I was going off into that crazy desert you guys have down there I am not sure if I want anything other than single speed. That would suck if you were out on a long sandy road and that hub came apart like a damn watch and springs and gears just shot out all over the damn place. If you ran a Pugsley fork up front you could have a spare drive wheel so if the Rohloff couldnt handle the Aussie desert you could swap out. I guess you could also put a little bit of thread locker on the screws that hold it together.
    Are you putting all of that water weight on the side bars or is some of it being held up by the main rack? I am curious to see how you have the water cans rigged up. Are you going to post up your trip on "Crazy Guy On A Bike" ? I assume you know about this other Aussie who did the Stock Canning on a Pug. Canning Stock Route by Bike 2005

  76. #76
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    so where does one find the faux yuba mundos?

  77. #77
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    Quote Originally Posted by PretendGentleman View Post
    so where does one find the faux yuba mundos?
    Yeah, and how much coin does one have to drop to get it?

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    Guys, I picked it up in sunny Melbourne, Victoria, where it rains for 9 months and drips off the trees for 3... It was a pure luck find, was walking past a cargo bike shop, saw it, went in an enquired, bloke wanted 400 bucks for it, it was a complete bike, so I rode it back to the backpackers.....

    It's fron China I think and it aint pretty.

    Lone Desert Walker, in answer to your queries;

    Dude, you really need to sweep your shop floor! It looks like you have not ever swept it
    Al; I havent but I do rake it occassionally.....

    Just kidding bro that looks like a cool shed.
    Al; I need to do something about the floor, it drives me insane when I drop something.....

    Do you know if your yuba is hi ten steel or 4130?
    Al; Hi tens steel, with a pretty rough rolled join, don't forget, this frame is really only being used for R & D.

    Is the bfl going on a Marge or something wider?
    Al; It's on a Rolling Daryl.

    Thats pretty crazy that Rohloff comming apart like that. I have always heard good things about those hubs, but they have a ton of moving parts and if I was going off into that crazy desert you guys have down there I am not sure if I want anything other than single speed. That would suck if you were out on a long sandy road and that hub came apart like a damn watch and springs and gears just shot out all over the damn place

    Al; It's very sus it coming to bits like that. I've done 000's of K's on that hub and NEVER had a whisper of a problem out of it. I look after it fairly carefully as well. Still maybe it just decided to toss all its screws out at once, I guess I'll never know. They've got locktite on them now and are torqued up correctly so I should have no problems with them. Did it all myself so I can only blame me if I have to push it for hundreds of K's

    If you ran a Pugsley fork up front you could have a spare drive wheel so if the Rohloff couldnt handle the Aussie desert you could swap out.
    Al; Sorry mate, I like my squishy fork on the front, eats corragations (washboard roads) for breakfast...

    I guess you could also put a little bit of thread locker on the screws that hold it together.
    Al; done.

    Are you putting all of that water weight on the side bars or is some of it being held up by the main rack?

    Al; Yep, 60 Kg was on the side bars, not too happy about it but want to keep the weight low as it's a real pig to push through the soft sand. I'm going to strengthen up the bars. Out here the water (40 L) would only last me 4 days in real tough times and up to 10 days in real good conditions (being very mindful of it as well i.e. very long hauls between puddles.)

    I am curious to see how you have the water cans rigged up.
    Al; Mate, they are just plastic water jerrycans and they are simply tied on with a good quality rope and an Aussie "truckers" knot. Nothing scientific about it. Using the KISS principle here.

    Are you going to post up your trip on "Crazy Guy On A Bike" ?
    Al; I'll see, I'm a bit lazy when it comes to documenting my trips and even lazier when it comes to posting on the net.

    I assume you know about this other Aussie who did the Stock Canning on a Pug. Canning Stock Route by Bike 2005
    Al: Yeah, there's been a couple and a Dude from New Zealand plus a women who also did it solo. Its one trip I intentend to do one day, u comin' along????

    Al
    Last edited by alanm; 05-01-2012 at 05:05 AM. Reason: Added info

  79. #79
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    I don't know whether to cry or curse (I try to never be caught doing either,LOL)...came home from a family day (the females hiked,the Boy n me rode) at the VA Creeper trail Sunday to find the heat pump/A/C had gone out. Was hoping for the best (something simple,just a service call),and while not as bad as it coulda been (it was repairable,doesn't need replaced),it wiped 90% of my Mundo budget out

    I won't get discouraged,I waited (at least) a decade to have conditions that I could own and acually use a cargo bike to be car-extrememly-lite,a few more months won't kill me.

    In the meantime,keeping my eye on CL for a used Xtracycle I may can horse-trade my way into,LOL
    '11 Origin 8 700CX
    '14 Surly Troll

  80. #80
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    Yuba Mundo Fat Bike

    My new Yuba Mundo is ridable now! So far w/o a sideloader and a kickstand. There is plenty of space at the rear with Surly Endomorpf (between 5 and 10 mm), less in the front with Larry (2-3mm). The fork is an "old Pugsley" from a friend. It takes 100mm hub and is 95mm wide. Axle to arch - 38.5 cm, axle to crown 43 cm. Newer forks from Surly are sure much wider, but this one was free and fairly close to the original fork in axle to crown distance. Tires are on original rims and they would NOT fit in the frame/fork on wide Surly rims. I run original Yuba parts with Avid bb5s (road - also a hand me down). With two spacers on the right side of a spindle I am able to use all three rings and the 3 smallest cogs at the rear. The lightest gear is 22-18. I am deciding between NuVinci hub and Rohloff. NuVinci will probably win since I have a good access to it at a decent price plus a good experience with it from my tandem. I would recommend anyone going my way to buy a really wide fork for 130mm hub and have a spare rear in case the gearhub fails in the middle of your trip. Overall I am amazed how agile Yuba is on those PHAT tires. Attaching some pictures from its maiden voyage. Keep on riding!
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-img_0628.jpg  

    The Yuba Mundo Thread-img_0632.jpg  

    The Yuba Mundo Thread-img_0631.jpg  

    Last edited by fox1965; 05-03-2012 at 11:54 AM.

  81. #81
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    Yuba Mundo Fat Bike

    Few more pictures
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-img_0625.jpg  

    The Yuba Mundo Thread-img_0627.jpg  

    The Yuba Mundo Thread-img_0630.jpg  


  82. #82
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    I LIKES!!!! Looks great,man,should be insanely fun to play with (by play,of course,I mean loaded down,bike camping,commuting....ANYthing you think of,that bike should do it )
    '11 Origin 8 700CX
    '14 Surly Troll

  83. #83
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    Fox, Well done Mate. Welcome to the world of fat tyred cargo bikes.

    Mate, one day we're gonna rule the world.........

    Al

  84. #84
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    Good job fox, looks sharp. Looks like your bottom bracket just got an inch higher for Monster trucking! Did you try the large marge endo combo in the rear or are you going off measurments? It seems like the endo would work on a Marge in the back. What kind of pressure are you running in those tires? Does it feel squirley on the 27mm rims? Now it looks like I need to get my act together. Which Nuvinci hub are you talking about? What I really want to know is do you get a bigger contact patch from running endos on 27mm or Hookworms on 65mm. If the patch size is close I might be tempted to go the wide rim way for more stability at low psi, and also because the nonoffset Large marge is bomb proof, especialy 36h downhill. Also there are some 3in tires that could be run on the bigger rims. And if I get a 135mm nonoffset pug fork I can run a Big fat larry on the front. But I am going Singlespeed with mine. I think I am going 24t or 26t chainring with 22t freewheel on one wheel and 16t freewheel on the other.
    Fox, what size rotors are you running on there, Did you have problems with the disk tab on the Yuba frame?

  85. #85
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    Yuba Mundo Fat Bike

    No, I had no problem with the disc brake tabs on either frame (orange V3 nor black V4). I run 160 mm in the front and 180(5?) at the back. I use the cheap bb5 road disc brakes and they worked fine so far (although I would recommend to go bigger in the front as well and to use bb7s). I usually carry my two daughters on it and have no problem braking. At 20psi the tires fit just fine on 27mm rims. The frame may take 65mm rim at the back, I just have to try it. I will try NuVinci 360 hub next week and let you guys know how it fitted and worked. It should have enough clearance, since I can run the third gear on the rear cluster (see the picture). And yes, the bottom bracket is much higher now but it seems to have no influence over stability. I can finally run 175 or 180mm cranks! I am very pleased with the result. With a lighter frame this bike is a true fat-tire-do-everything bike. Keep on riding!
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-img_0634.jpg  


  86. #86
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    Quote Originally Posted by fox1965 View Post
    No, I had no problem with the disc brake tabs on either frame (orange V3 nor black V4). I run 160 mm in the front and 180(5?) at the back. I use the cheap bb5 road disc brakes and they worked fine so far (although I would recommend to go bigger in the front as well and to use bb7s). I usually carry my two daughters on it and have no problem braking. At 20psi the tires fit just fine on 27mm rims. The frame may take 65mm rim at the back, I just have to try it. I will try NuVinci 360 hub next week and let you guys know how it fitted and worked. It should have enough clearance, since I can run the third gear on the rear cluster (see the picture). And yes, the bottom bracket is much higher now but it seems to have no influence over stability. I can finally run 175 or 180mm cranks! I am very pleased with the result. With a lighter frame this bike is a true fat-tire-do-everything bike. Keep on riding!
    are those spokes corroded or is that dirt on 'em?

    I'm still pretty sure I don't want the stock build, mostly because I don't trust the quality of the wheels. If those spokes are corroded and you don't live on the beach, then my suspicions were too mild!

  87. #87
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    Quote Originally Posted by PretendGentleman View Post
    are those spokes corroded or is that dirt on 'em?

    I'm still pretty sure I don't want the stock build, mostly because I don't trust the quality of the wheels. If those spokes are corroded and you don't live on the beach, then my suspicions were too mild!
    Good eyes! I tried to polish one of the spokes and I must admit I am not sure. The spokes and rims are so filthy that it is hard to tell if it is dirt or corrosion. Anyway, I would totally rely on the original set of wheels - this pair has been through two long winters of daily riding in a salty icy slush, snow, on ice, and in the mud with 200 pounds of load and 200 pounds of me. I occasionally hit the stuff under the snow and even when I tore a chunk of metal from the rim, the wheels stayed true. I actually never needed to true them - the rear wheel with its 48 spokes is phenomenal. They are heavy and you can sure build lighter wheels of the same strength if you wish to spend that money. Salsa makes great strong rims with up to 48 spokes. It is much harder to get a decent hub with 48 holes - any tips?

  88. #88
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    Tire and Rim Limits for Yuba Mundo

    For the fat tire Yuba Mundo hungry crowd I am sending info about frame and fork limits for tires and rim sizes. (You can always cut the cantilever bosses off - although it may be a good idea to keep them just in case your disc brake fails irreparably). This is for the new V.4 frame and fork. The old V.3 fork had a little more space close to the top.
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-img_0641.jpg  

    The Yuba Mundo Thread-img_0642.jpg  

    The Yuba Mundo Thread-img_0643.jpg  

    The Yuba Mundo Thread-img_0645.jpg  

    Last edited by fox1965; 05-05-2012 at 07:36 AM. Reason: Edit: It is CM NOT Inches

  89. #89
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    Yuba Mundo Complete

    with straps, bags, kids etc...
    Attached Thumbnails Attached Thumbnails The Yuba Mundo Thread-img_0646.jpg  

    The Yuba Mundo Thread-img_0649.jpg  

    The Yuba Mundo Thread-img_0653.jpg  


  90. #90
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    Quote Originally Posted by fox1965 View Post
    Good eyes! I tried to polish one of the spokes and I must admit I am not sure. The spokes and rims are so filthy that it is hard to tell if it is dirt or corrosion. Anyway, I would totally rely on the original set of wheels - this pair has been through two long winters of daily riding in a salty icy slush, snow, on ice, and in the mud with 200 pounds of load and 200 pounds of me. I occasionally hit the stuff under the snow and even when I tore a chunk of metal from the rim, the wheels stayed true. I actually never needed to true them - the rear wheel with its 48 spokes is phenomenal. They are heavy and you can sure build lighter wheels of the same strength if you wish to spend that money. Salsa makes great strong rims with up to 48 spokes. It is much harder to get a decent hub with 48 holes - any tips?
    tandem hubs are the primary users of 48h hubs. I have a pair of 40 spoke rim brake only wheels and the rear has a drum brake. I'm thinking I'll use these for my Yuba.

    I'm pretty sure I'm gonna bite the bullet when the frames are available at the end of May. I had been thinking about a big dummy for the last two+ years, but after hearing reviews consistently state that the yuba is more stable under the heaviest loads, I'm pretty much convinced.

    But at the same time, my desire for a cargo bike is competing with my desire for a mtb tandem and a fat bike and a zillion other things on my wish list. The worst part is that I'm moving in with my fiancee at the end of the month and I'll have to use a car if I don't buy the yuba complete!

  91. #91
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    Yo Fox, that thing is awsome! I want one of those steco racks for my Yuba and my Pug. Now that you have had a little bit of weight on El Mundo Gordo what do you think of the handling. Do the tires feel squirly with weight? Did you have to pump them up more? Are you running Surly tubes?

    Pretend Gentleman: I think you will be happy with the Yuba because it doubles as a fatbike and a tandem (sort of) it really is a do everything bike.

  92. #92
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    Front fender

    Guys,

    I fitted a front fender to the Yuba lookalike, which incidentally I think is based on a YM V1.

    I tried to redo the radius to miss my water bottle.... no worky..... I then heated the offending area and used a seat stem to make an indent, much better.

    I've put a link up here; Fat Mudgaurd (fender) on a WB Groove 200

    Al

  93. #93
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    Dude, whats with the fender? Why do you even want one on there? Does your front tire flip sand all over? I do like the craftsmanship, good job with the custom work there. The front of your bike looks like a motorcycle! I guess the fender kind of protects the water bottle, but I would worry about the fender causing a problem in the desert. I think the more simple your bike the more reliable, but also I guess you will have some extra materials to rig up an emergency repair. That fender could make a splint in a pinch. When is your expedition? How many liters of beer are you bringing?

  94. #94
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    Hey "Mr Walker"....

    In answer to your queries;

    Dude, whats with the fender? Why do you even want one on there? Does your front tire flip sand all over?
    Mate, when it gets wet, particularly on the beach I get tired of getting crud sprayed all over my feet.....

    I do like the craftsmanship, good job with the custom work there.
    Thanks, it looks a bit rough in the flesh but hey it was the first time having a go at bending the plastic.

    The front of your bike looks like a motorcycle! I guess the fender kind of protects the water bottle, but I would worry about the fender causing a problem in the desert.
    Mate, if it misbehaves in any way, it'll get ripped off, hung on a tree and told to make it's own way home.....

    I think the more simple your bike the more reliable,
    I agree.

    but also I guess you will have some extra materials to rig up an emergency repair. That fender could make a splint in a pinch.
    True.


    When is your expedition?
    Not until next May.

    How many liters of beer are you bringing?
    How much does it weigh per liter.....

    Al

  95. #95
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    Quote Originally Posted by PretendGentleman View Post
    I'm pretty sure I'm gonna bite the bullet when the frames are available at the end of May. I had been thinking about a big dummy for the last two+ years, but after hearing reviews consistently state that the yuba is more stable under the heaviest loads, I'm pretty much convinced.
    Are these new frames? As in V5.0, or just more 4.0s?

    I've been drooling over the Big Dummy for a while, but I think the Mundo geometry makes more sens. (Sacrilege, I know...)

  96. #96
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    Belt & suspenders brakes




    I have the bread basket front rack. In the photo below, the canti brake cable has just hit the mounting bracket. I can go to 90 deg without the brake applying itself.


  97. #97
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    Quote Originally Posted by slimhazy View Post
    Are these new frames? As in V5.0, or just more 4.0s?

    I've been drooling over the Big Dummy for a while, but I think the Mundo geometry makes more sens. (Sacrilege, I know...)
    The surly is better made for sure. When I added the cantis I found that the left brake boss was about 3-4 mm higher than the one on the right. Sure it still works and all, but is typical of the way the Yuba is made.

    Update; the bosses are not actually that far off. I had seriously de-centered the front wheel when I increased the spoke tension. This is my first/only bike with disk brakes, and I didn't realize the front wheel was dished. The de-centered rim required a large difference in pad locations on the brake arms, which I mistook as a stud issue.
    Last edited by gumby_kevbo; 08-10-2015 at 07:34 AM. Reason: Updated info

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    Are the disc brakes road version or mtb? Are the levers short or long travel? I am thinking of adding cantis to the front as well to distribute the load along the entire fork.

  99. #99
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    Quote Originally Posted by slimhazy View Post
    Are these new frames? As in V5.0, or just more 4.0s?

    I've been drooling over the Big Dummy for a while, but I think the Mundo geometry makes more sens. (Sacrilege, I know...)
    My guess is v4.0's

    I just came across this guy's troubles with his yuba mundo disc brake mounts.

    mundo yuba ę My Yuba Mundo Build

    For those of you with a yuba with factory disc brake mounts, have you had this same problem?

    anybody have a v4.0 and not had this problem?

    Another thing that occurred to me about 14mm rear wheel with freewheel is how inferior the axle supports are on the drive side compared to a freehub cassette. For freewheels the last bearing on the drive side is near the threads, leaving a couple of inches of unsupported axle before you get to the dropout. With cassette hubs the freehub has load supporting bearings that are only a centimeter or two away from the dropout. A lot of the 14mm axle's extra strength is going to offset this poor design.

  100. #100
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    Quote Originally Posted by fox1965 View Post
    Are the disc brakes road version or mtb? Are the levers short or long travel? I am thinking of adding cantis to the front as well to distribute the load along the entire fork.
    The disks and levers are long travel, the cantis are intended as short travel, but the pads are as close as possible to the pivots, increasing the leverage. The levers have a balancing arraignment so both cables are tensioned near equally. So the disks are probably providing about 2/3 of the braking power according to sound SWAG analysis . Mostly I was just tired of looking at the sad unused studs....but also those beefy rims: just wrong not to get some of the braking load into them.

    I have only a couple trips on the bike since adding the cantis. But it is obvious that the front brake has some serious power even though the pads are not yet run in.

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