As I said, the rims are stock-sized rims--7" front, 8.5" rear. I have Kumho V710s, 245/45-17 front and 275/40-17 rear. They certainly bulge, but they don't rub. Frankly, for autocross, the bulging strikes me as a good thing (less stress on the tire edge), although I wouldn't want it for street tires.