Yes I know, and I made a mistake by going by that. Maybe it's for leagle resons from people not using bead locks??? I went out and bought some 10" wheels. I'm the only person in my class using them. They explained to me the wider wheel lets the tire flatten out for more rubber on the ground. Here is a pic of them on a 10" wheel. As you can see by the dust from rolling it around the shop floor, there is only 7 1/2" of rubber hitting the ground