Hi, Hugh. When my 1972 Sports Tourer started breaking spokes, Rich Lesnik built new 700C wheels with Synergy rims on my original hubs, which look like the Phil 'Rivy' hubs. Thus it needed no frame spacing change in the rear; and the O/C rear wheel improved the strength of the 120mm-spaced rear wheel. It's been all good since! I kept the original center-pull brakes by extending the shoe slots with an endmill to gain the 4mm or so of adjustment required. That's not a recommendation!! A brake with more reach would have been the safe approach. I looked over my '90 Bstone MB-1 with XT cantilevers, and if yours are similar, the brake shoe post will have to angle downward to contact a smaller wheel's rim, because there is no adjustment for rim diameter. I don't like the prospects - some of your braking force will be lost to a bending moment applied to the shoe's post, and the angled shoe will have more chance for tire contact. Those are old brakes, and mine are old eyes. Maybe the adjustment you need exists in a modern brake, or maybe I just didn't see it. So take a good look at yours! Ben
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