Does anyone have any idea about the offset and rear spacing for the TTA? I am going to change to a 15" wheel and try to keep the same offset and tire dia. I need to start using tire screws and don't want to drill into my factry rims. Last time I ran at the track, my rims spun inside the tire about an inch because of low tire preasure and I still spun the tires a little. So I want to go with a Draglite wheel, but don't want anything to rub or look too oversized. Also, should I go with a 3 1/2" up front or 4"? Any help would be Great. Thanks.