WTB: 650C stuff, mountain risers

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AASHTA: as always Sheldon has the answer.

see tire_sizing for lots of info. In short, there are 3 different 650 sizes, which are about 5%, 6% and 8% smaller than 700C. The only common one is the 650C (~8% smaller) used on plenty of tri bikes and road bikes targeted at women. But there’s a quixotic attempt to revive the 650B size, see, for example http://sixfiftyb.com/

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