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  1. #1
    Dirty nerotic bike whore
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    29er front 650b rear? opinions?

    I have been loving my 29er experience lately but have been thinking when I had my rear wheel built for my hifi dlx I should have went 650b because well it just seemed interesting. Would that have worked? I am about to build my dad a bike and was thinking of doing this for his bike as well. Everyone always talks about 26er rear 650b front but not much on 29er front 650b rear from what little I have looked up.

  2. #2
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    I am interested in experimenting with this set up as well. Currently riding a 650B'd Bianchi GUSS. I hope to get a loaner 29er wheel soon.

  3. #3
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    It would absolutely work, and would give you a slight better (lower) gear ratio as well. More and more riders are switching to moto-x style setups, with the 69er, 26/650b or B6, and 650b/29er. I personally ride a B6 setup and like having the faster spinup and lower gearing out back, with the better rollover up front.

  4. #4
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    Quote Originally Posted by Dirty Bastard View Post
    ...Everyone always talks about 26er rear 650b front but not much on 29er front 650b rear from what little I have looked up.
    The 650b drops the rear axle 3/4 inch from a 29 wheel.

    A 26" wheel drops the rear axle 1/2 inch from 650b.

    With both larger front wheel combos, the BB drops about 2/3'rd of the difference in axle height, and the fork and seat tube slacks [(x) degrees * (y) axle drop].

    The chain stay and wheelbase of a 29'er frame is typically 1 or more inches longer than a 26 inch frame fitting the same rider.

    Put the geometry together and the conclusion is that 650b front-only converts a 26" bike very well, but no one seems to like 650b rear conversation on a 29'er..

  5. #5
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    "Put the geometry together and the conclusion is that 650b front-only converts a 26" bike very well, but no one seems to like 650b rear conversation on a 29'er.."

    Good point, derby.

  6. #6
    middle ring single track
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    It works...

    ...see my original write-up here:

    Stumpy B-niner conversion...

    My conclusions as to the viability of this configuration remain the same. It all depends on the preferences of the rider. For me, the Stumpy 29er set up with a 650b was an improvement (but if the Stumpy could have accepted a wider 29" tire in the rear I would have left it as a "full" 29er)

    Setting up a 29er to a "B-niner" is about the easiest conversion around; maybe it's "too easy" to be attracting much attention?

    Here's my bike out in the boonies on a ride yestersday:
    <a href="http://s1042.photobucket.com/albums/b426/pliebenberg/Bikes%20and%20Bike%20Hardware/?action=view&amp;current=DSC01471.jpg" target="_blank"><img src="http://i1042.photobucket.com/albums/b426/pliebenberg/Bikes%20and%20Bike%20Hardware/DSC01471.jpg" border="0" alt="Photobucket"></a>
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  7. #7
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  8. #8
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    Quote Originally Posted by derby View Post
    The 650b drops the rear axle 3/4 inch from a 29 wheel.

    A 26" wheel drops the rear axle 1/2 inch from 650b.

    With both larger front wheel combos, the BB drops about 2/3'rd of the difference in axle height, and the fork and seat tube slacks [(x) degrees * (y) axle drop].

    The chain stay and wheelbase of a 29'er frame is typically 1 or more inches longer than a 26 inch frame fitting the same rider.

    Put the geometry together and the conclusion is that 650b front-only converts a 26" bike very well, but no one seems to like 650b rear conversation on a 29'er..
    should work best with a 650b frame.

  9. #9
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    Quote Originally Posted by hellocook View Post
    should work best with a 650b frame.
    Yes, a 650b front, rear, and both will be the standard for mountain bikes in 10 years. BMX will continue to be the groomed trail and urban wheel standard.

    Until then we need to innovate while the industry giants milk their obsolete production investment.

  10. #10
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    I'm thinking about turning my Bianchi DISS into a 69er with a niner fork up front. Has anyone had any luck with this? I tried sending a PM to a couple people, but it told me I hadn't posted enough yet. Any help would be lovely.

  11. #11
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    Quote Originally Posted by xxjoshuapxx View Post
    I'm thinking about turning my Bianchi DISS into a 69er with a niner fork up front. Has anyone had any luck with this? I tried sending a PM to a couple people, but it told me I hadn't posted enough yet. Any help would be lovely.
    I would suggest creating a new thread specific to your setup, would probably get more visibility. Good luck!

  12. #12
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    I like mine

    I just put together a mix just like this. Sette Serum frame (26" HT) with a 80mm Reba 29er front and 650b rear. Even with the 650b rear i think the head angle has slacked out to around 67 degrees. To be honest, its more responsive than i thought it would be and not much more difficult to climb than with my Trek 6700 and its 71 degree head angle. It also seems to roll over stuff smoother and after only one ride, i feel more confident on it. The 26er frame and the 650b rear with a Quasi Moto on the back seems to hook on on the climbs in SoCal. Here's a couple of pics




  13. #13
    Witty McWitterson
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    My wife has been on a B9 for a couple years. She can't say enough good things about it.

    <a href="http://www.flickr.com/photos/48107563@N00/5927855551/" title="Singular Hummingbird by unclefuzzy_ss, on Flickr"><img src="http://farm7.static.flickr.com/6147/5927855551_6911e28397_z.jpg" width="640" height="512" alt="Singular Hummingbird"></a>

    I've had her ride a full 9er, and she doesn't like it a bit. Says the larger rear wheel hangs up on her. Loves the big front though.
    Just a regular guy.

  14. #14
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    nice

  15. #15
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    To the OP, if you've got the cash, then give it a try, only you can really tell if it'll work for you. I know I totally enjoyed when I 69d my Trance a few years back, was very fun and plan on building it back up again that way, but right now enjoying the newer breed of slacker, short stay 29ers that have come out.

    You honestly believe that the big manufacturers are going to kill the 26" wheel bike in preference for the 650B? I must say you're quite the optomist, your glass must always be half full even when there's only a drain left in it. Far as I remember, this is going on 4 or 5 years 650B has been trying to gain a foothold and while some manufacturers came on board for a bit, ultimately they bailed and have since put more focus to 29ers.

    Ultimately a mountain bike is a mountain bike and once you're riding all's good, but the benefits of a good 29er HT for the majority of the market of recreational riders where big manufacturers make the money is ery hard to argue - just look to the big 3s 2012 lineups for proof.

    Quote Originally Posted by derby View Post
    Yes, a 650b front, rear, and both will be the standard for mountain bikes in 10 years. BMX will continue to be the groomed trail and urban wheel standard.

    Until then we need to innovate while the industry giants milk their obsolete production investment.
    One day your life will flash before your eyes, will it be worth watching??

  16. #16
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    Quote Originally Posted by LyNx View Post
    ...
    You honestly believe that the big manufacturers are going to kill the 26" wheel bike in preference for the 650B? I must say you're quite the optimist, your glass must always be half full ....
    Well 29'er caught on much slower than 650b is growing, and 26 inch mountain bikes also took a decade to gain as many riders as 29'er back in the day. 650b appears to be growing in use faster than either.

    It really requires riding 650b to understand why there is more rapid acceptance.

    Sure 29 and 26 inch wheels will continue, and match up well with 650b when taller front wheels become more common.

  17. #17
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    I don't know, there's a few companies that have come on board and invested in making product for it, but when you can tell is when they bring another product to market for the 650B platform. I personally would love to buy and build a 650B set of wheels to try in different configurations, but the main place I use (Jenson) has stopped carrying them, which to me signifies that the market for their sales was very low and not worth their time.

    Personally I totally see the merits of 650B, it gives better rolls over than a 26" yet isn't quite as big as a 29". I will still ride my 29ers as I don't see any negatives to my riding style or terrain (neither here, nor when I have visited abroad) that people seem to see with them. Most especially since I moved away from the old school steep, racer boy geo 29er s were known for and to more relaxed angles using the new greater offset forks. Confidence is high climbing and descending and the bikes are very manuverable.


    Quote Originally Posted by derby View Post
    Well 29'er caught on much slower than 650b is growing, and 26 inch mountain bikes also took a decade to gain as many riders as 29'er back in the day. 650b appears to be growing in use faster than either.

    It really requires riding 650b to understand why there is more rapid acceptance.

    Sure 29 and 26 inch wheels will continue, and match up well with 650b when taller front wheels become more common.
    One day your life will flash before your eyes, will it be worth watching??

  18. #18
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    I too shop at Jenson's often, mostly because its down the street from me and they are a great group of folks. Their 650b selection is tiny. Type 650b into their search and you get 4 items. Tubes and Quasi's are 2 of them and what i need mostly. As for wheels, i had mine built online at Prowheelbuilder. They took a while but had the Blunts i wanted and was able to mostly do a budget wheel for under $200. They have better and lighter options (i got entry level shimano hubs) to configure if you want.

    I think, at least in Southern California, 650b is looked at as just a novelty. How many pro downhillers are running 29ers? I don't think any. If there were more frames built on the 650b and a better selection of tires (i do love my Quasi's for XC/Trail riding) for downhill type riding i really think the following would grow. 29ers can be built stiff and strong, but, at a price of cash and weight. I think a 650b would be great for this application. A bit lighter and stronger than a 29er and increased rollover compared to a 26. Without frames though, its a moot point.

    As for XC wise though, my frame fits a Quasi with minimal room around the chainstay. I'm not sure how it would do if packed up with mud, but, for the typical loose over hardpack, hardpack, or sanding riding i do 98% of the time i love my short chainstay (about 425mm).

  19. #19
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    I really like the B9 (29 front, 650B rear) concept. I have been running that setup on my 29 bikes mainly when I am riding trails with long steep climbs. It seems like it gives me just enough better "gearing" in that situation to be more enjoyable than a 29 rear wheel. I can't detect much effect that the geometry change would have had. Before I tried the 650B in the back, I also tried a 69er setup. I like the B9 better. 26 wheels are just too small for me.

  20. #20
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    I ride my 29er ss with 650b on the rear. It just snaps up to speed quicker than a 29er rear. When ever I go back to full 29er ss, it feels like It is slow to get up to speed. Just build a set of 650b wheels and swap them with 29er wheels, rear, front or both. Buy a White Brothers 650b fork and your old 26er will be more fun than it ever was as a full 26er.

  21. #21
    middle ring single track
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    Intriguing!

    Quote Originally Posted by jetboy23 View Post
    I just put together a mix just like this. Sette Serum frame (26" HT) with a 80mm Reba 29er front and 650b rear. Even with the 650b rear i think the head angle has slacked out to around 67 degrees. To be honest, its more responsive than i thought it would be and not much more difficult to climb than with my Trek 6700 and its 71 degree head angle. It also seems to roll over stuff smoother and after only one ride, i feel more confident on it. The 26er frame and the 650b rear with a Quasi Moto on the back seems to hook on on the climbs in SoCal. Here's a couple of pics
    What's your as-built weight?

    What size rear tire and how's the clearance? (photos?)
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  22. #22
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    Quote Originally Posted by pliebenberg View Post
    What's your as-built weight?

    What size rear tire and how's the clearance? (photos?)
    I went budget on most of the components (mid level expense) and added weight with a chain guide since i wanted to be able to decend in my small ring. Front tire is heavy (maxxis ardent 2.4) and wheel set is probably 2300gr or more. Dropper seatpost adds weight, but, convenience. All done, its around 27lbs. Lighter than my Trek 6700 though.

    Seat stay has really good clearance



    Derailleur/Seat post and bottom bracket area is good too



    Chainstay area is tight. 2-4mm from the side knobs on a 2.0 Quasi-Moto mounted on a Blunt



    I'm not sure if i would be able to fit a Neo-Moto or a Nevegal, but, i really like the traction and roll i get from the Quasi here in Southern California.

  23. #23
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    Pliebenberg, Nice bike!

  24. #24
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    Jetbo23, nice ride/setup!

  25. #25
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    I love mine.
    (Sorry for the crappy picture.)
    Attached Thumbnails Attached Thumbnails 29er front 650b rear? opinions?-guss.jpg  

    Last edited by JudgeMorris; 09-01-2011 at 07:54 AM.

  26. #26
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    Rumble Fish B29

    650B(2.35 Schwalbe Hans Dampf ust) out back with 29er(Specialized Captain 2.2 ust) front and I like it a lot. I use a RS revelation 120/140 in the 120 the BB is 13.2/140 13.5"
    Attached Thumbnails Attached Thumbnails 29er front 650b rear? opinions?-imag0110.jpg  

    29er front 650b rear? opinions?-imag0112.jpg  


  27. #27
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    Hello from the past ladies and gentlemen.
    Looking back at this argument from 4+ years ago, 650b has essentially killed off 26" wheels and 26+, 27+, 29+ are the new fun ideas that will prob be common place in a few more years to come.

    Back to the orig post, can anyone tell me if a 27+ rear with a 2.4 29" front would be a decent ride on my 2012 Tallboy C? the theory behind it sounds good an dI'd like the slacker HT angle.... I am assuming at least one of you have tried this by now

  28. #28
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    Quote Originally Posted by Herpnasty View Post
    Hello from the past ladies and gentlemen.
    Looking back at this argument from 4+ years ago, 650b has essentially killed off 26" wheels and 26+, 27+, 29+ are the new fun ideas that will prob be common place in a few more years to come.

    Back to the orig post, can anyone tell me if a 27+ rear with a 2.4 29" front would be a decent ride on my 2012 Tallboy C? the theory behind it sounds good an dI'd like the slacker HT angle.... I am assuming at least one of you have tried this by now
    Thinking back to my TBc I don't remember there being the clearance for a 27.5+ back there.

    Depending on the tire it's pretty close to a 29er diameter so I doubt you're going to slacken it up much.

    Are you running a 100 or 120 fork?
    Last edited by TwoTone; 04-13-2017 at 06:44 PM.
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  29. #29
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    Running 120mm Pike up front. Just tried a 650B Schwalbe Rocket Ron 3.0 in the rear and it fits. They only run 2.8" wide and 2.4" thick... so I may be able to squeeze a 29" Rocket ron 3.0 in there. Up front, if Schwalbe keeps those measurements for the 3.0 Nobby Nic (highly unlikely) I could fit a 3.0 on my 29" hoops. I'm gonna try

  30. #30
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    On what width rims? Ask because my Nobby Nic 2.8"s measured out pretty true, so be careful and note that most tyres will stretch over time, best to inflate to Maxx PSI and let sit overnight to get a better idea of size. If you're running them on anything under 25mm IW, be careful about taking the pressure above 30, it might not hold on the narrow rim well.

    Quote Originally Posted by Herpnasty View Post
    Running 120mm Pike up front. Just tried a 650B Schwalbe Rocket Ron 3.0 in the rear and it fits. They only run 2.8" wide and 2.4" thick... so I may be able to squeeze a 29" Rocket ron 3.0 in there. Up front, if Schwalbe keeps those measurements for the 3.0 Nobby Nic (highly unlikely) I could fit a 3.0 on my 29" hoops. I'm gonna try
    One day your life will flash before your eyes, will it be worth watching??

  31. #31
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    Quote Originally Posted by LyNx View Post
    On what width rims? Ask because my Nobby Nic 2.8"s measured out pretty true, so be careful and note that most tyres will stretch over time, best to inflate to Maxx PSI and let sit overnight to get a better idea of size. If you're running them on anything under 25mm IW, be careful about taking the pressure above 30, it might not hold on the narrow rim well.
    The rims are WTB Frequency i23's..... not ideal, and I plan to UG them eventually, but they are what was laying around when I wanted to try a 27+ on my 29er. Inner Diameter is 23mm, and yes, I am not taking them above 30psi. Why would you when tubeless plus tires are known for being great in the 15-25psi range?

    Your Nonny Nicks were true to size? good to know for my front set up. My current Trail King 2.4 is pretty true to size and barely clears my Pike, plenty of width, not so much height.
    I'll swap over my running gear and try to throw up a photo when I get that rear wheel in there

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