I just spoke to Chris at Tires Direct about replacing my bald stock F1 tires. They lasted 22.000 miles. I still have the stock rims. I told him that I want to run the 315/35/17 555r's in the rear and the normal 555 275/40/17 for the front, and he said that it is not a good idea, because the tire is designed for a 10.5 - 12.5 inch rim, and if I used it on the stock rim it could present some safety problems and since the rim is not wide enough, it would not provide any added contact patch with the road. He recommended goind with the 275's in the rear. I told him that I have headr of plenty of people running the 315/35/17 555r's on the stock rims, with no problems whatsoever. Has anyone ever had any problems with these tires on the STOCk rim? what do you guys think?