NOW, I'm not sure I completely understand where you are coming from on this (addressed to Mr. Floyd) but there is a HECK of a lot more effects to a car when changing wheel diameter, even on an IT car, than just gearing changes... You don't need different wheels to change gearing, just go to a taller tire. Oh, but why wouldn't you want to do that??? For the opposite reason why you WOULD want to go to a lower profile tire... SIDEWALL height...
I don't agree that there isn't a performance improvement, even if some magazine decided to publish a test to show otherwise... But regardless, there are other factors that can be effected as well.
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