I'm going to be using Shimano calipers with Avid mounting adapters. I think they are supposed to work ok if the caliper doesn't hit the bracket, but just in case, I wanted to ask about where the brake pad is supposed to clamp on the rotor. Is ALL of the pad supposed to contact the rotor, or is it OK to have a little bit of pad hang over the outer edge of the rotor? The problem in this case is that it will leave a little un-worn nub on the brake pads. The problem in the other case if the rotor sticks out a bit past the pads is that the rotor will rub the little spring clip that pushes the pads apart.