That's also a very good point I was thinking about yesterday, but didn't get around to posting before I went to sleep. The new crop of 200tw tires don't like to be pinched on narrow wheels. They perform best with proper width rims. I think most people would be fine with the IT allowed rim widths already in the rules since most of us are restricted by the contact patch/fender rule first anyway. My car can fit a lot of tire up front legally, but eventually it's depreciating returns as it's more rotating weight and more drag.