so this is more of a question to see what most people have done with their wheel situation. i think this is just for the GXP because they have 2 different sized tires. is it a good idea to get a pair of rims of either of the sized tires and have all the same size on your GP so you're able to rotate them? on the 07 GXP they have front: P255/45R18 back: P225/50R18