Join Date: Jun 2010
Location: NW,Oregon Coast
Mentioned: 25 Post(s)
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When I built my touring frame 30 years ago, I had the wheels built and the brake parts in my hand.
Mafac cantilevers, the location of the brake boss is the most important adjustment.
so rather than a number, test fit the parts, where the tubes are further apart on the rear
the swing of the caliper around the brake pivot axis is different.
Boss location is a different radius from the hub axle, than if closer together, like on the fork.
once adjustable brakes, shoe mounting slots, in Mountain bike boom,
I noted the boss location got sloppier, because they could let stuff pass ..