I test fitted some racing hart C2's today, but they hit the caliper.
They are 18x7.5 with a +42 offset running a 235/40/18. I really don't want to shave the calipers down, is there any other way to fix this problem?
Get rid of the wheels, would be my 2 cents. You could run spacers like Mike had said but depending on how much is hitting, running spacers would bring your offset lower. I believe with a 7.5" in the front, you wont be able to run anything lower then the +42 without rubbing issues.