"CIRCMAND--- Not to threadjack, but to answer your question. It's the tire "width" that causes rubbing primarily due to the wide swing "turning arc" of the front tires. In fact, it is possible to go taller on O.D. by using skinnier/narrow tires without any rubbing issues."by riff raff
I just want to clear this up IT IS BOTH !!! The width and height. It really depends on the tire height and the tire width. Since most people do not go with a narrower tire ,then you need to watch the height of the tire. If you go to tall you will have issues. shawn