I have 35*14.50R16 on my truck and i have 16*10 rims with 4.5 backspacing. and i have a skyjacker add a leaf and 4in blocks in the rear. and i had to cut the bumper like an 1/8th of an inch and a small piece on the cab that you can't see unless you get under the truck. and they only rub on the leaf spring when you turn all the way. so if you got a little narrower tire they wouldn't rub. Hope that helps