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  1. #1
    Senior Member Bat56's Avatar
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    Are all 42T chainrings the same outside diameter?

    I replaced an old aluminum 42T chainring with the stainless Surly. Now my back wheel sits forward enough that I might need to add a link to the chain. What I am saying is that the wheel used to be pretty much centered in the drop outs (not track drop outs) and now it sits way forward. Here is a before shot, I do not have an after shot.

    My math is telling me that the OD of the chain ring should be the same... but I'm no math man.
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  2. #2
    * adriano's Avatar
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    they are with very slight variation due to teeth shape.

  3. #3
    :)
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    also, an old/worn out ring (esp. alu) will have some wear.
    Quote Originally Posted by Santaria View Post
    because physics has more street cred than tarckstars.

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