Hell bent for pleather
Join Date: Jul 2006
Location: post-apocalyptic wasteland
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Assuming clincher tires...
Just measure the diameter of the rims, between the points where the tire bead settles inside the rim.
Then measure the diameter of the tire itself between the sides, when inflated. A caliper might be the best tool for this.
1" = 25,4mm, for people who still live in the Dark (imperial) Ages.
630mm rim diameter = so called 27" tires
622mm rim diameter = 700C tires
584mm dim diameter = 650B tires
Read this article and your soul will be enlightened by the spirit of St. Sheldon Brown, peace be upon him:
Last edited by fatsoforgotso; 06-19-09 at 03:23 PM.