I'm hoping to get some recommendations from some riders who know more than I do. I have recently built a Surly LHT. I'm running 26" Sunrims Rhynolite rims that measure 28mm wide at the braking surface. I ordered Avid Shorty 6 cantilever brakes to give me the best chance of getting enough clearance for wider/taller knobbies when I want to use them as well as fenders and my Luxos U front lamp. However, when installing the brakes, I found that I was unable to use any of the concave/convex washers to control the cant angle of the brakepads. The brakes are on the bike, and they do stop it well enough, but they ALWAYS squeal hideously. I took the bike to the local (and very reputable) LBS to solve a derailleur issue, and thought to ask about the brakes while there, the mechanics said that the rims were too wide for what I had if I wanted to be able to do any fine adjustments, and that I should choose a different brake model.