I have the sport lites and there is plenty of clearance for my disc brakes. I just checked my 15x7's and the the id towards the top is 14'' then about 2 inches in it starts to taper down to just over 13". I honestly though wouldn't use them for the rear of any high hp/tq track setup. They seems decently thick around the hub but being cast...... and how good is their casting process???
