If you lower your car about 1-1/2":
225/40/18 - Won't have to roll rear fenders
215/45/18
225/45/18 - Roll rear fenders
235/40/18
245/40/18
255/35/18 - Unsure
But this is what I think. I'm running RX-8 wheels with 225/40 tire and all the way down on BC's. I don't rub.
