The local dragstrips around here run what they call a "5.70" class for the 1/8 mile. Basically, it's an index class where everyone is limited to a 5.70 in the 1/8. One of their rules limits tire size to no wider than 10.5". No W's or anything like that. Now, get this. They won't allow anything wider than a 10" wide wheel. Is this retarded or what? If you use a 10" wide wheel with 10" or 10.5" wide slicks, you only get around 8" of rubber on the ground. They don't want the racers to have the extra advantage of the full tread width. If that's the case, why don't they just limit all cars to an 8" wide slick instead of 10.5"?