I know what sizes I run. My crossfire is so low, about 2.5" off the ground I run a big stretch so i dont rub. It doesn't matter what tires I run I have the same issue. I think Rudy might be right, but since the car is totaled i don't plan on looking into it further. I was having issues with the speedometer being intermittently off (mostly when near a cop lol) anywhere from 12-18mph off