Thats funny because I was just talking to a buddy of mine about this same thing. I was thinking of using a 6" wide rim. My buddy is using 15 x 7 up front and 15 x 8 in the back. But he has them on his Shitvelle. I told him I thought the 15 x 7 were to big and I wanted to run a rim size of 15 x 6...