Page 1 of 5 12345 LastLast
Results 1 to 50 of 209
  1. #1
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137

    Less 'Beast'ly Fat Bike

    So I'm new here, and I hope members dont get the wrong idea - that the Walgoose bike has brought the riff raff out of the woodwork. I've been researching fat bikes for about a year now and have been lurking and learning. My problem is - I was reluctant to drop $2k on a bike without the ability to test ride one. The cheapo Walmart bike is my solution. Allows me to start fat biking with a reasonable investment.

    I've read it all and others are doing similar things, but here we go. Ultimate goal is a sub-35lb. fat bike with gears and disc brakes. Things move kind of slowly here on the Big Island of Hawaii. Everything takes longer to ship in - although most everything I will be doing will be used/donated parts from friends and the LBS.

    First one didn't make it here in one piece -




    Second try went much better -


    Weighed it on the digital bathroom scale. Stripped of reflectors and decals it weighed in at 48.8lbs!

    Got a plan and started collecting parts:

  2. #2
    gone walk about
    Reputation: nvphatty's Avatar
    Join Date
    Mar 2012
    Posts
    8,036
    happy gooseing
    plus+, plus+ = win:

  3. #3
    Puro Vida!
    Reputation: Nelson34's Avatar
    Join Date
    Apr 2009
    Posts
    1,303

    Less 'Beast'ly Fat Bike

    How is the bike? Maybe a good bike for my mrs?

  4. #4
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    I'm happy with it... but I am looking for a project starting point. It is way to heavy, needs gearing and needs brakes terribly. So basically unless you are looking for a project, I probably wouldn't go this direction.

  5. #5
    mtbr member
    Reputation:
    Join Date
    Jun 2008
    Posts
    7
    It only needs gearing if you aren't into singlespeeds. Definitely not a must. Here's mine. Good luck on your build.

    Less 'Beast'ly Fat Bike-photo.jpg

  6. #6
    Human Test Subject
    Reputation: Volsung's Avatar
    Join Date
    Nov 2011
    Posts
    872
    Thank you for starting another mongoose thread. The other 9 weren't quite enough.

  7. #7
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    I'm involved in many forums and in every case, my posts are highly technical and enjoyed by all.
    This would be an example:
    Next Briggs powered chop - Club Chopper Forums

    Hopefully, you can give it a chance and keep postive.

    -Greg

  8. #8
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    Hub sits at 100mm wide- I'm going to add 30mm to it and build a solid titanium axle.

  9. #9
    mtbr member
    Reputation:
    Join Date
    Feb 2012
    Posts
    456
    WOW, I took the time to read all pages of the Briggs build, As a powder coater and custom fabricator I can really appreciate the finish and details.
    I really like the effort put into the many photos documenting the build.

  10. #10
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    Thanks- hopefully this will turn out just as intriguing.

  11. #11
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    Every spoke nipple looked like a drill bit was used on them



  12. #12
    mtbr member
    Reputation: thing's Avatar
    Join Date
    Oct 2007
    Posts
    124
    damn thats a cool bike

    looking forward to seeing how this one turns out

  13. #13
    Rogue Exterminator
    Reputation: kjlued's Avatar
    Join Date
    Jun 2011
    Posts
    4,956
    I dunno but to me it seems in your attempt to try affordable fatbiking you, if you carry out your plans to upgrade, you will end up spending just as much money.

    Oh well, should still be interesting.
    Just stick it in granny and start grinding.

  14. #14
    mtbr member
    Reputation: vaultbrad's Avatar
    Join Date
    Oct 2007
    Posts
    881
    Quote Originally Posted by kjlued View Post
    I dunno but to me it seems in your attempt to try affordable fatbiking you, if you carry out your plans to upgrade, you will end up spending just as much money.

    Oh well, should still be interesting.
    It looks like our new friend likes projects, which is awesome. This little cheapy is easier to justify cutting and modifying than a more expensive bike.

    I'll be watching this thread closely.

  15. #15
    mtbr member
    Reputation:
    Join Date
    May 2009
    Posts
    581
    Please document as fully as possible since what you do might translate into other projects, not that the Walbeast isn't a fun challenge.

  16. #16
    mtbr member
    Reputation: Siddhartha Valmont's Avatar
    Join Date
    Feb 2013
    Posts
    18
    Quote Originally Posted by kjlued View Post
    I dunno but to me it seems in your attempt to try affordable fatbiking you, if you carry out your plans to upgrade, you will end up spending just as much money.

    Oh well, should still be interesting.
    If he keeps reasonable, it is possible to push the Walgoose to a setup with disk brakes and realistic tires & tubes for $350 (meaning a total of $550). All the rest (drilling, wheel rebuilding, paint or whatever else...) is just time so it is cheaper and nicer if tinkering is a hobby

  17. #17
    Nemophilist
    Reputation: TrailMaker's Avatar
    Join Date
    Sep 2007
    Posts
    1,873
    Hey;

    Buying a turn key bike is not always the goal. Anyone can do that if they have the funds. Some of us even make the entire thing!
    Most people ply the Well Trodden Path. A few seek a different way, and leave a Trail behind.
    - John Hajny, a.k.a. TrailMaker

  18. #18
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    ^^ exactly how I think.

    Cut the front hub in half this morning...



  19. #19
    mtbr member
    Reputation:
    Join Date
    Mar 2011
    Posts
    113
    Quote Originally Posted by chopsmitty View Post
    Every spoke nipple looked like a drill bit was used on them


    Could you please throw that unlaced rim on a scale? The best feature of this bike may be the rims. I'd love to know how many grams they weigh prior to drilling.

  20. #20
    Rogue Exterminator
    Reputation: kjlued's Avatar
    Join Date
    Jun 2011
    Posts
    4,956
    Quote Originally Posted by TrailMaker View Post
    Hey;

    Buying a turn key bike is not always the goal. Anyone can do that if they have the funds. Some of us even make the entire thing!
    Hey, I get that totally.

    Not my thing but still cool if it makes him smile.
    Just stick it in granny and start grinding.

  21. #21
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    Bare rim weight - 1234 g

  22. #22
    mtbr member
    Reputation:
    Join Date
    May 2009
    Posts
    581
    Individuals have "drilled" about 300 grams from each rim, but I'll bet you can do better.

  23. #23
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    I am tempted to cut them on the cnc, but I'd have to swing the head... We'll cross that bridge when we get there.

  24. #24
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137





    Stock hub with bearings, axle, nuts etc - 326 grams
    New hub complete minus disc brake - 388 grams

  25. #25
    mtbr member
    Reputation: Velobike's Avatar
    Join Date
    Jun 2007
    Posts
    6,030
    Keep it coming.

    Looks like you're aiming for being the Manuel Beastly of bike modification...
    As little bike as possible, as silent as possible.
    Latitude: 57º36' Highlands, Scotland

  26. #26
    mtbr member
    Reputation: sasquatch rides a SS's Avatar
    Join Date
    Dec 2010
    Posts
    4,557
    subscribed! this thread looks promising

  27. #27
    gran jefe
    Reputation:
    Join Date
    Nov 2011
    Posts
    2,688
    wow. nice work so far. subscribed.

  28. #28
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    Next project is to reinforce the rim at it's 'weld'. I am able to see light through the joint - it appears to be only joined at the outer rim edges... Then we are going to drill them.

  29. #29
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    Walked in to work and on my desk were more used goodies from the resident mountain biker. Between Grant and Matt at Mountain Road Cycles - this thing is coming along...

  30. #30
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    Forgot to mention - total weight of the RaceFace parts - 691g

  31. #31
    gran jefe
    Reputation:
    Join Date
    Nov 2011
    Posts
    2,688
    i think that crank would survive a nuclear war! wow...

  32. #32
    mtbr member
    Reputation: dudeist's Avatar
    Join Date
    Apr 2013
    Posts
    250
    Someone on I think Rat Rod Bikes stripped and polished the rims and they look very cool.

  33. #33
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    I was thinking of doing just that - because I have to strip the joint to be welded.

  34. #34
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137


    Finished product weighs 1014g.

  35. #35
    mtbr member
    Reputation: dudeist's Avatar
    Join Date
    Apr 2013
    Posts
    250
    Last edited by dudeist; 05-03-2013 at 10:05 PM.

  36. #36
    mtbr member
    Reputation: gmats's Avatar
    Join Date
    Apr 2005
    Posts
    2,691
    *****in'. That's like 1/2 lb right there. Nice!!

  37. #37
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    I made a quick model of the wheel in Solidworks and did a stress analysis with a couple different hole designs. This one proved to be the strongest with the most weight removal.

  38. #38
    mtbr member
    Reputation: Greenfin's Avatar
    Join Date
    Jun 2011
    Posts
    332
    Great Work keep it up!
    Still cleaning my Fatback.
    It's a life style.

  39. #39
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137


    Going to have to fix the chain line while adding new gearing... But we'll tackle that when the rear wheel gets built and we can see what works on the rear hub.

  40. #40
    mtbr member
    Reputation: Velobike's Avatar
    Join Date
    Jun 2007
    Posts
    6,030
    Quote Originally Posted by chopsmitty View Post
    I made a quick model of the wheel in Solidworks and did a stress analysis with a couple different hole designs. This one proved to be the strongest with the most weight removal.
    That's interesting. I got the same pattern when I worked out how I wanted to lighten my rims.

    My method was more low tech using my man-in-a-shed with hand tools ethos - I used masking tape and joined up the spoke holes because I figured the metal was only needed between them. Then I outlined the edges of the masking tape and ended up with your pattern.

    BTW why leave the valve hole area untouched? Do we actually need a valve hole - surely it can simply be in one of the open areas? It's a bit more weight to save.
    As little bike as possible, as silent as possible.
    Latitude: 57º36' Highlands, Scotland

  41. #41
    Are we there yet?
    Reputation: AlmostQuick's Avatar
    Join Date
    Jan 2010
    Posts
    171
    Chopsmitty, you obviously are a very skilled craftsman, and we all love seeing your work.

    I can see you are a perfectionist. Doesn't it bother you starting off a project with junk like this bike? There are so many issues going on here that you might as well start from scratch. I wouldn't be surprised to find frames out of line too. (we've already seen forks)

    I drilled my front wheel, (turned out nice) and moved on to the rear. Had everything marked off and drill in hand. Then upon closer inspection, I could see the wheel had been over tightened, and the cheap rims were slightly deformed at the spoke holes.

    Since the rear wheel supports more weight, and is subject to the stress of driving and braking, I couldn't do it. Junky parts, crappy quality control.

    (my rims aren't even the same color. Front is white(ish) silver, and the rear is greyish silver)

  42. #42
    mtbr member
    Reputation: Velobike's Avatar
    Join Date
    Jun 2007
    Posts
    6,030
    Quote Originally Posted by AlmostQuick View Post
    ...I could see the wheel had been over tightened, and the cheap rims were slightly deformed at the spoke holes...
    Easily fixed - use spoke washers to spread the load. The wheel won't collapse.
    As little bike as possible, as silent as possible.
    Latitude: 57º36' Highlands, Scotland

  43. #43
    mtbr member
    Reputation: vikb's Avatar
    Join Date
    Sep 2008
    Posts
    8,632
    Quote Originally Posted by AlmostQuick View Post
    Chopsmitty, you obviously are a very skilled craftsman, and we all love seeing your work.

    I can see you are a perfectionist. Doesn't it bother you starting off a project with junk like this bike?
    I'm hoping that the last step in this project will be to weld up a new Ti frame!
    Safe riding,

    Vik
    www.vikapproved.com

  44. #44
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    Velobike, i can't imagine doing that by hand - the CNC did it for me and the whole job took just over an hour.

  45. #45
    MaverickMotoMedia.com
    Reputation: Gigantic's Avatar
    Join Date
    Aug 2012
    Posts
    2,717
    wow. you can spitshine a turd!
    Maverick Moto Media Motorcycles, Mountain Biking & Social Media Mgt
    Facebook Twitter Instagram

  46. #46
    mtbr member
    Reputation:
    Join Date
    Dec 2012
    Posts
    137
    Quote Originally Posted by vikb View Post
    I'm hoping that the last step in this project will be to weld up a new Ti frame!
    That is exactly what I was thinking- but it's going to take a while. I have too many projects in the works now!

  47. #47
    mtbr member
    Reputation:
    Join Date
    Jun 2008
    Posts
    7
    Quote Originally Posted by Gigantic View Post
    wow. you can spitshine a turd!
    Carefull....that almost sounded like a compliment

  48. #48
    mtbr member
    Reputation:
    Join Date
    May 2011
    Posts
    1,166
    Quote Originally Posted by chopsmitty View Post
    I made a quick model of the wheel in Solidworks and did a stress analysis with a couple different hole designs. This one proved to be the strongest with the most weight removal.
    I sure wish I had your setup... that must have nice edges.

    Rim's only Al. Maybe it's time to build a micro CNC setup.

    Any chance of posting:
    - a jpg of the cutout template with dimensions?
    - comparative strength against no cutouts, and against 1.5" circle cutouts?

    If one were to cutout such a shape with drill bits, and an appropriate saw for the straight edges, how critical is it to keep the edge square and the straight into the corners smooth to avoid stress risers?

  49. #49
    A Surly Maverick
    Reputation: Dr Feelygood !'s Avatar
    Join Date
    Jun 2006
    Posts
    2,565
    Great job so far !

    LOVE what you did with the wheel cutouts
    A Fatback'd Lefty for who life IS a Beach

  50. #50
    gran jefe
    Reputation:
    Join Date
    Nov 2011
    Posts
    2,688
    chopsmitty, pretty amazing. nice work!

Page 1 of 5 12345 LastLast

Similar Threads

  1. Replies: 61
    Last Post: 10-25-2013, 08:35 PM
  2. Replies: 57
    Last Post: 07-09-2013, 02:22 PM
  3. Replies: 9
    Last Post: 05-30-2013, 11:52 AM
  4. mountain bike comfort, road bike speed,which bike?
    By traumamagnit in forum Bike and Frame discussion
    Replies: 3
    Last Post: 07-23-2011, 07:25 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •