Actual Wheel Diamter (or Radius)- Mtbr.com
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  1. #1
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    Actual Wheel Diamter (or Radius)

    Looking at a short chainstay 29er frame build.

    Since wheel clearance is a factor due to the target of short chainstays (420mm), do I take a current wheel and get a true measurement of the diameter to use as the for my measurements?
    You cannot go against nature, because when you do, its part of nature too.

  2. #2
    pvd
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    622 + 2 * 64 = 750

  3. #3
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    If you have a specific tyre in mind, and access, then I would take a few measurements from the actual wheel/tyre as a starting point. Just be careful if itís a very small tyre, you donít build yourself into a corner where you can never fit anything bigger.

  4. #4
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    With all the frames I built so far, I always made sure to have the rear wheel with the tire I was planning to run assembled and available for measurement. I've also measured lots of my friends tires too. The math equation PVD posted is very handy and all that data should be on the tire sidewall. I like to double check the result from the tire size calculation against what I actually measure, just for a sanity check.
    What Cord posted is also something to think about. I have a hardtail that I probably should have dimpled the chainstays for tire clearance a little more than I did before I painted it. It's never going to fit anything larger than the 2.5 I built it around.

  5. #5
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    Thanks all for the replies....helped out.

    PVD, I spent a fair amount of time reading your blog...thanks for all that information
    You cannot go against nature, because when you do, its part of nature too.

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