Oh and CC is .. cubic centi meters a measure of volume , not distance .
the common diameter number used is what the tire and rim manufacturers arrived on
to see to it their products fit each other ..
that is tire Bead Seat diameter , you will find that on the tire sidewall ... like 32-622 etc.
Last edited by fietsbob; 11-17-10 at 01:33 PM.
Reason: correction