Jay, now you have me thinkin... I did some reading on tirerack.com about rim widths and tire sizes. The narrower the rim, the narrower the tire width (but the wall would be taller). So that got me to thinking....pack on a 245/55-16 and I'd have a relatively wide tire width and same tire wall height compared to the stock 225/60-16. Does that make sense? Would it be worth it though? Would there be any squealing or rubbing assoc with a new size?
to have the same or very close overal tire diameter as the 225/60r16 that you have on there, the tire would have to be a 245/55r16, which are very rare and more expensive. a 245/50r16 would be smaller than stock and would throw the speedometer a little, unless you get is reprogramed.
if you are going for better grip, you want the bigger ones up from where the power is put to the ground.
but in a car like this with all the computer BS, you really want the same size tire on all 4's. If one end is a little smaller than the other, it may trip the traction control or ABS cus one set of tires will be spinning faster than the other and the car thinks its slipping.