mancello@acf4.UUCP (11/29/84)
What does the 700C denote with regards to wheel measurement.
700C wheels are more common in Europe than the States except for
racing bikes.
Dom Mancelloreid@Glacier.ARPA (12/03/84)
> What does the 700C denote with regards to wheel measurement? > > 700C wheels are more common in Europe than the States except for > racing bikes. > Dom Mancello It is just an identifier; it doesn't actually stand for anything. There are several different rim sizing codes. The French scheme has sizes like 700, 700A, 700B, 700C, 650, 650A, 650B, etc. The British scheme calls the same rims EA2, EA4, F10, EA6, K.1, F.4, F9, and F.12 respectively. The old British scheme, which is used in many American bike shops, would call those rims 28x1-1/4, 28x1-3/8, 28x1-1/2, 28x1-3/4, 26x1-1/4, etc. However, the rims that the French call 700C and the British call EA6 and used to call 28x1-3/4, Schwinn calls 28x1-1/2. Except in Canada. There is also the Vredenstein-Paragon scheme, used in the Netherlands, by which a 700C is a 28x--x1-3/4(V). To avoid this madness, the European Tire and Rim Technical Organization, ETRTO, has come up with a standard sizing scheme that is being pushed as multinational. Most new rims and tires are labeled with ETRTO labels. The ETRTO scheme actually categorizes rims by how big they are! So a 700C rim that is 25mm wide is called size 25-622 (because the rim is 622mm in diameter at the place where the tire bead sits on the rim). For the record, the outside rim diameter of a 700C rim is 634mm, and the diameter of a typical tire for a 700C rim is about 700mm (tire diameters range from 670mm to 725mm; the "700" is just a typical value. Brian Reid decwrl!glacier!reid Stanford Reid@SU-Glacier.ARPA