Joined: Nov 2005
Posts: 4,049
Likes: 2,122
From: NW Ohio
Bikes: 1984 Miyata 310, 1986 Schwinn Sierra, 1987 Ross Mt. Hood, 1988 Schwinn LeTour, 1988 Trek 400T, 1981 Fuji S12-1977 Univega Grand Rally, S LTD, 1973 Sears Free Spirit 531, 197? FW Evans
650A is 590 mm diameter and 650B is 584 mm. That's only 3 mm difference in the radius, so I would think most cantilever brakes would have enough adjustment. If they didn't, it would be simpler to swap to different brakes than to move the studs.