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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.
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I will agree with that, but if you're going to look at how the tire temp changes are different with different size tires, then you might as well start looking at everything, such as fuel load. As you use fuel your balance is going to change, just like it will with tire temps. I know some guys that used to race using methanol but have switched to race gas because you don't use nearly as much over the course of the race, which means the change in balance isn't as drastic.
Of course, with street tires, this is just about pointless. lol But if you're serious about competing (in sanctioned racing), nothing is left out of the equation.
I still say that tire sizes differences from front to rear can be dialed in with the right chassis setup.