What is the rule on backspacing? I plan on getting 37x12.5x15 tires. The rims I was looking at have 3.625 inches of backspacing. Will this work? Thanks in advance.

 

Stock backspacing is 4.5 however the 3.625 will fit but you are going to have a lot of tire outside the body. You are planning on putting 15" rims on your truck? You do know the smallest rim you can use because of the brakes is a 17", correct?

 

I have 4" of back space on the rims on my truck and there is about 2" of tire sticking out. That is why I went with the bushwhacker fender flares to keep the paint from getting beat up. And PIRATA is correct....the 15's won't work.

 

Oh. I was unaware of that. Thanks a lot guys. So 17" minimum.