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Originally Posted by Derek69SS
The big rear tires are cool if you're not serious about road-racing/track days (which most of us aren't but if you are...), they will come up to temp much slower than the smaller fronts, effecting the balance of the car differently throughout the run... if it starts neutral, when the fronts get sticky it will go loose, then the fronts get too hot as the rears just start to get sticky and it goes tight. They also require running the springs/shocks further inboard negatively effecting the motion-ratios.
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FWIW, my '71 Camaro with a modified LS1 uses 265 front and 295 rear Pilot Sport Cup tires on the track (Portland Raceway). After a 20 min session, the pyrometer shows the rear tires 5-10 degrees hotter than the fronts, even with 4 PSI greater hot pressure.
I notice that high-powered RWD cars with near 50/50 weight balance (Viper, Z06) are often running 50mm or more rear stagger, even in full-race setups. You want that kind of car to keep the rear end stuck down when hard on the throttle exiting turns. Something like, say, a spec Miata is a somewhat different story ...
Finally, keep in mind that a solid axle car provides no provision for negative camber in the rear. Personally, I will run the biggest tires that will fit on both ends, then tune with camber, shocks, and tire pressures.