I got one of the wheels today to check it out o my truck. Not exactly sure how the whole backspacing-thing works. I measured a little over four inches from the lug holes to the outside of the rim in the back and 6 inches in the front. So I assume I have 4+ inches of backspace. Also, the rims are 15X10, but the tires are 35 12.50 15's. I put one on the front end and turned turned the steering wheels as far as possible bot ways. I will definately have to trim.