My rear wheel has some damage on the brakeing surface. How major is this? I've had the wheel trued since the damage occured and it spins straight, but there are some scratches in the al. They look kind of deap, but I don't see any cracks. Mainly when I break I can hear it faintly everytime my wheel rolls around to that position again. I would think this is harder on the brakes but how might it change performance?