I'm going to get some cheap 15's for some drag radials for my car and I was wondering what backspacing or offset or whatever do I need to get? I dont know anything about that stuff.
The complete tire size will help us. The higher positive offset, the further in the wheel well the wheel and tire will sit. The offset is the distance between the centerline of the wheel and the hub mounting surface. Backspacing is the amount of wheel that is from the hub mounting serface to the outside lip. Most of the 17X8 Mustang wheels have a +30mm with 5.5" of back spacing. I'm sure stock 15" wheels are less than that. Get the size tire and lets go from there.