Hi I have a Trek with avid juicy 7/carbon brakes 160mm rotors. recently i bought a spare set of wheels. upon changing the wheels i now find the discs rub to the point that the wheels will hardly freewheel. changing to the original wheel the disc rubbing continues. the rotors have not been used much and so i assume that the wear on the same is v v similar, looking at them. i have used the adjustment on the lever and that really has not made that much difference. i now seem to be stuck with 2 sets of wheels which rub, any answers out there?