We have 33x12.50/15's. Spare on the back is the same. PO must have done some serious off roading and had to do some creative welding since the weight of the tire/wheel caused the back door itself to crack right down the middle. Didn't help much. First week we owned it, we went around a corner, and the back door flexed and swung open, spare and all, all by itself! No bueno. By the next week, we had a SB XRC bumper and tire carrier put on. Problem solved.