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tire sizes
AMuzi wrote:
'700' started out at 642mm (historically measured like wagon wheels at the very outside diameter, 700mm). As roads improved and tires narrowed, a new smaller lighter version of 700 at 635mm appeared so the 642mm became "700A" and the new one "700B". So that's the origin of all the 700s! 635 and 622 are still around, the 622 being the more common of the two it seems. But "there is no queen of tires", right? (Since everyone just made things up to suit their need/desire, there were two 700B, both at 1995mm=635mm and 1992mm=634mm) The circumference. Historically measured like... windmills? Lest you think that we moderns are more rational or smarter than The Ancients No one is thinking that. Ancient morons make modern morons... note that your example of 650B was known as a 26" size (26 x 1-3/4) for a hundred years and nearly died out before being rebranded as 'twenty seven and a half' because it's in the middle of the 26" tire range and smaller than 27 inches. Why wasn't it rebranded "twenty seven minus a half" rather? -- underground experts united http://user.it.uu.se/~embe8573 |
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