multimodal commuter
Join Date: Nov 2006
Location: NJ, NYC, LI
Posts: 19,808
Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
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I think Iowegian's has covered it all correctly. Another option, by the way, would be 650 A, which is a little bigger than 650B; but 650B is probably better.
Bear in mind that smaller wheels will lower the whole frame, and necessitate shorter crank arms. I actually prefer shorter crank arms, so I put 26" (the MTB size) wheels on an early 70's Lambert (made for 27" wheels) which lowered the BB, which was the whole point of the exercise; but I couldn't find any rim brakes to fit it that way. I put drum brake hubs on it. It worked out very nicely.