about his question? I'm pretty sure he is saying that only the wheels are all the same size. But he wants to know if having different aspect ratios (thus different sized tire) will make the car less stable. For example if in the rear you have 225/45/18 and in the front you have 225/40/18. Or another possibility is like the 350z set-up, you have 225/50/17 in front and 235/50/17 in the rear, also giving you taller tires in the rear.