It seems like the substantial part of the target audience is ChumpCar and LeMons competitors. Since both groups are already on 180 TW tires, it would make sense to include those tires as part of the class rules. LeChumpers already have experience with these street tires and probably an inventory of Rivals or Direzzas. Not having a tire rule will force them to go the rcomp route to be competitive -- and if they are racing they will want to be competitive. This seems to be more a barrier to entry than a 180 TW tire rule.

Terry