Here are my Breyton GTS-R wheels on the coupe.
225/40R18x7.5 et 45 with a 12mm spacer up front
255/35R18x8.5 et 48 with no spacer in the back
Over a seriously aggressive bump, the front rubbed for a split second on the fender. This makes no sense to me based on all the calcs I have done. Unless the 7.5" wheel making the shoulder of the tire is more square caused it, but I still think there should be plenty of room. Tired are Direzza ZII which are also a little more square than a PS2.