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  1. #1
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    Could it be this simple?

    I've been lurking on this forum for awhile because the bigger wheeled bikes really suit my riding/racing style. I ride a HT 29er and a FS 29er (Lentz Leviathan) and I love them. I also own an 05 FSR Stumpjumper that is a great bike. I've looked into converting it to a 650B, but the fit just doesn't look possible, which seems to be the issue with a lot of folks. So here is my question, with all the interest in the performance of a 650B, and clearance such a great issue, why not just mount 650B wheels on a 29er frame and fork? Thus no more clearance problems. and there are plenty of 29er frames and forks on the market. If this is a stupid question you may chastise me severely.

    Is the real issue just fitting 650Bs on existing frames/forks (like I would have done on my Stumpjumper)? That seems unlikely in most cases.

  2. #2
    Mr.650b - Mr.27-5
    Reputation: Kirk Pacenti's Avatar
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    Quote Originally Posted by K.C.
    I've been lurking on this forum for awhile because the bigger wheeled bikes really suit my riding/racing style. I ride a HT 29er and a FS 29er (Lentz Leviathan) and I love them. I also own an 05 FSR Stumpjumper that is a great bike. I've looked into converting it to a 650B, but the fit just doesn't look possible, which seems to be the issue with a lot of folks. So here is my question, with all the interest in the performance of a 650B, and clearance such a great issue, why not just mount 650B wheels on a 29er frame and fork? Thus no more clearance problems. and there are plenty of 29er frames and forks on the market. If this is a stupid question you may chastise me severely.

    Is the real issue just fitting 650Bs on existing frames/forks (like I would have done on my Stumpjumper)? That seems unlikely in most cases.

    The BB would end up too low...

  3. #3
    mtbr member
    Reputation: MMcG's Avatar
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    yeah for most if not all 29ers the bb would be pretty low.

  4. #4
    nothing relevant to say
    Reputation: Cracked Headtube's Avatar
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    You're also keeping an extra long wheelbase. I tried it on my Soul Dillinger, and haven't really enjoyed the results. Moving up from a 26" frame works much better.
    My Soul didnt have a low BB afterwards, BUT i is equipped with a EBB, which I rotated to the highest position to achieve a 12.125" BB height.
    http://650bpalace.blogspot.com/2007/...nice-brew.html

  5. #5
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    Hmmm.....

    That all makes sense, I didn't think of the longer wheelbase isssus. I just did some quick approx. measurements, SJ (26) BB clearance 12.25" and whealbase (QR to QR) 43.25" ; Lentz Lev (29 FS) BB clearance 13" and wheeelbase 44" ; Soma Juice (29 HT) BB clearance 12.75" and wheelbase 44" I run all three of these bikes 2X9 with a bashguard, allowing more clearance advantages. I don't know if there are shorter 29er wheelbase frames, or if a 2X9 setup would be enough to help with clearance. What I do know is that larger tires fit my riding style (long and fast XC) very well.

  6. #6
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    You could run 100mm travel on say a Reba, with a 650B bit of a waste on the longer fork with huge clearance mind, but it'd keep the angles the same as a 145mm ish fork rather than a 160mm fork.

    Personally, 80mm Reba + 29" wheel still.

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