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Old 02-27-09, 01:34 PM
aka Tom Reingold
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Location: High Falls, NY, USA
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Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem

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Look at the 700 as an arbitrary number, not really related to the diameter of the wheel. In truth, it bears a historical, rough relation to the size, but it's pretty much lost. 700C means 622mm bead diameter. The other one is related to the tire width, not the tire height. Tires are not round in profile, though they are roughly. The number is actually the distance D/2.5 where D is the distance between the beads when the tire is flattened on a flat surface. But a 700x23C tire will usually have a width of approximately 23mm. Some taller tires will have a narrower width, and of course shorter tires will have a wider width.
Tom Reingold,
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