47C tires on 650B wheels!
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I remember those bikes. Very stylish and good quality, but impractical because of the stupid and pointless oddball wheel size. It is my understanding, though, that 650B/27.5 tires might actually fit - funnily enough, I don't recall ever seeing a 650B tire in my bike shop career before the '27.5' standard was brought into mountain bikes years later.
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Seems like asking a bit much in a nation that has accepted the abuse of the word "rhetoric" -- a perfectly good word to describe the art of persuasion -- in place of polemic, the default mode of discourse in the US and much of the world.
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You are misunderstanding the French system. There was a 700B rim that had a 635mm tire bead seat. The “700x38B” is the same misuse of the French designation as “700x38C” would be. The B and C are in the wrong place and should be 700Bx38 and 700Cx38. At this point it’s kind of hopeless to try to correct it because as Tevye says “TRADITION!”