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I'm not talking about making EVERY car (or even a high number of cars) class-optional, only ones that don't seem to fit now. How many cars do you want to move into ITB from ITA (for example) but can't or won't because of cage and/or wheel issues? Those are the ones to focus on initially.
I'm not trying to sound like a broken record on this, but if a car does or does not have to buy new wheels (7" -> 6") should have no bearing on moving the car from ITA to ITB. I support the concpet of class cross-over for tweeners with limitations (see my earlier comments), but the wheel issue is a personal choice. Don't muddy things up by including it in the discussion.