Does anybody have any experience with putting 18's on a convertable with no suspension alterations? I was wondering if I should swap to 17's or 18's for my covertable without having to mess with my stock suspension for now. I know of plenty of people putting 17's on thier RX7's with no problems, but if I put 18 by 8.5 wheels with 225/40/18 tires will there be any clearance problem?