I am definately going with a 225/40-18 (Side wall height: 90) in the front, and thinking of one of the following for the rears: 235/40-18 (Side wall height: 94) 245/40-18 (Side wall height: 98) I think perfect sidewall would be 87.~ something. Thoughts on whether the latter (245) will even fit? (Mule you will have some good input with your current setup.) Oh and going with So2s all the way around. I already ordered the fronts in So2s. Just trying to decide which rears. I really would rather the rears be 245 with more rubber to protect the incredibly expensive wheels I am buying (its gonna be a suprise!) Also, next year I am probably also getting a good set of sport springs and lowering the car a bit. (anything to make it flater in the twisties) So this is something to consider with a larger tire as well.