Mmmm....
Let me muddy the water just a bit. Stock on a C6 vette is 18's in the front and 19's in the rear. With run flats and a z-51 suspension get .95 on the skid pad. Run flats are pretty hard tire. C6 Z06 are running the same 18/19 combo but I believe it is a 275 up front and a 305 in the rear...it pulled right at 1.0 g.
I understand the physics of rotational enertia, even if I can't spell it, but on a street car I am not sure you would loose that much, but I have no practical expeirence with this. I will tell you to run as much sidewall as possible, you will thank me the first time you hit a pot hole you did not see. I have 18's on an 850 and I can tell you I spend most of my time looking for holes while I am driving.
I believe the hot set-up for track cars is an 18 in front and 17 in the rear
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