Quote:
Originally Posted by churchx
venturaII: At auto-x. There, limitations of class rules and importance of grip no matter illeffects dictates everything. Take out those artificial limitations, and get people showing better laptimes in HPDE with 215-225 (though of grippier rubber compound of course).
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People are NOT going faster with 215-225/45 on 7" rims than they are when using 245/40 on the same wheel. That combination simply would not exist if it wasn't faster. Don't throw a random caveat in there about "different compounds" because you're comparing apples and oranges at that point. The theoretical benefit of optimal tire width for a given rim size doesn't outweigh (no pun intended..) the advantage of a less optimal combination putting more rubber on the ground, especially when there's almost no weight penalty to go along with it.