29er wheels in a 650b+ frame?- Mtbr.com
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  1. #1
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    29er wheels in a 650b+ frame?

    Anyone tried doing this? I have a 2019 Nukeproof Scout 275. Was thinking of getting a 29er wheelset for it or even just running a 29er wheel up front and experimenting with that setup.

    My main concern is going to be ... fork offset. The nukeproof builds come with a 51mm offset on the 29er and 46mm offset on the 27.5+. Will I get away with running a 29er in the 27.5+ fork w/46mm offset?

  2. #2
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    Canít Speak to the offset, although I donít imagine it will make much difference. I run 29er wheels in my Yeti SB5+ (with a 51 offset 29er fork) and absolutely love it!

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    My understanding is lower offset will make the bike more stable or more lazy depending on how you look at it. But if I combine lower offset with slacker HTA (if I run a 27.5+ rear) then it'll be even more stable or lazy.

    Different in HTA will be under .5 degrees from what I can tell. These numbers seem so marginal, am I making a big deal out of nothing here?

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    The other question I have is the bike specs mention 29x2.5 max tyre. I'm guessing that is clearance in the rear right? Rockshox sektor RL 140 can take a max of 29x2.8 is that right?

    I'm trying to keep tyre options open, from what I can tell most tyres are either 2.3 or 2.6. Maxxis make a few 2.4,2.5 options I know.

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    Quote Originally Posted by crembz View Post
    The other question I have is the bike specs mention 29x2.5 max tyre. I'm guessing that is clearance in the rear right? Rockshox sektor RL 140 can take a max of 29x2.8 is that right?

    I'm trying to keep tyre options open, from what I can tell most tyres are either 2.3 or 2.6. Maxxis make a few 2.4,2.5 options I know.
    I think you'll find better by measuring yourself the fork. SRAM literature does not seem to mention max tire size for 29". I know that Fox allows 29x2.6 or 27.5x2.8.

    But note that 2.3 tires will likely be narrow trail (for using with rims with internal trail smaller than 30mm), while some 2.4, and all 2.5 and 2.6 will be wide trail (WT), to be used with rims 30-35mm. So your optimal rims will change depending on the tire you pick.

    Of course you can mount a wide tire on a narrow rim and vice-versa, but then the rolling profile of the tire will change, and cornering will be compromised.

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    I'm pretty sure the fork on that bike is a standard 27.5 fork, not a 29/27.5+ fork. If that is the case, it won't fit a 29 inch wheel. As for the offset you mention, 46 is the standard for a 27.5 fork, 51 is standard for 29 fork. Thats changed recently, with a lot of brands doing shorter offset stuff, but when changing the wheel size that is going to be more what you notice than the offset.

    Just because it has clearance in the back for 27.5x2.8 does not mean it'll fit a 29er wheel. 27.5+ wheels are still not as tall as 29 inch wheels. I'd see if you can borrow a wheel from someone to see if it will work. But I'm pretty sure if you wanted to do this you would for sure need a different fork.
    Patrick

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    I think you might be right. Measuring everything up I currently have about 15mm of clearance to the top of the tyre. I could possibly get a 29x2.3 tyre in at most but that's probably not what I'm looking to run.

    Unfortunately I don't have anyone with a boost front wheel I could borrow. The LBS offered to swap a few wheels in and out but they also suggested the most I'd get in there would be 29x2.3. No chance I'll get 29x2.4 or larger in.

    I'll have to scrap this plan for a later date.

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