Thread: Is 700c and 27" the same?
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Old 04-18-11 | 03:28 PM
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cyccommute
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Originally Posted by bradtx
MTBerJim, There are two types of 700 tires available for road bikes, tubular (sew-up) and clincher (seperate tube) and the C stands for clincher.

Brad
Nope. 700A is an obsolete rim that measured 642mm at the bead. 700B is a mostly obsolete wheel size that measures 635mm. 700C is a rim that measures 622mm. 700D is a 587mm rim size that GT tried to make popular...and failed miserably. In the original French system the letter designation referred to the tire width. An 'A' was narrow and a 'C' was wide but that system was soon abandoned. Clinchers and tubular tires don't have a designation that I know of. Both use 622mm rims.

A 29" mountain bike wheel is really just a rebadged 700C rim. Same size: 622mm
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