Explaining 29er vs 26 geometry- Mtbr.com
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  1. #1
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    Explaining 29er vs 26 geometry

    So I was telling a friend of mine about my new 29er, and he asked me if frame makers simply made every tube a little longer to accommodate for the bigger wheels, while retaining the same basic geometry as a 26". Instinctively I said "no," but then I couldn't really explain what the geometric differences are. I know the front ends tend to be different, because of toe-overlap issues, but what the heck ARE the frame differences between 26 and 29?

    I realize that every bike is probably a little different, but does anyone have a simple way to generalize -- a "longer X but shorter Y" kind of rule of thumb?

  2. #2
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    Quote Originally Posted by Godless Communist
    So I was telling a friend of mine about my new 29er, and he asked me if frame makers simply made every tube a little longer to accommodate for the bigger wheels, while retaining the same basic geometry as a 26". Instinctively I said "no," but then I couldn't really explain what the geometric differences are. I know the front ends tend to be different, because of toe-overlap issues, but what the heck ARE the frame differences between 26 and 29?

    I realize that every bike is probably a little different, but does anyone have a simple way to generalize -- a "longer X but shorter Y" kind of rule of thumb?
    Frame geometry and frame design/tube dimensions are different things. There are changes made to the latter just to get the wheels to fit the bike: Longer down tube, shorter head tube, longer stays and fork.

    And they are related to the few made to the former for handling: more BB drop, slightly different HTA and/or fork offset. As far as rider fit, they should be the same.
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  3. #3
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    Totally depends on the bike. The geometry of a Gary Fisher Rumblefish is substantially different from a Tallboy, for example. There is no direct 26/29 differentiation.

  4. #4
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    Thanks, shiggy and lawfarm -- both of those responses are helpful.

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