does anyone run 245/40 and 265/35 18's? I did a search in tire rack and there were alot more choices using the 40 and 35 sizing as aposed to a 40 and 40 size. I'm looking for a good autocross/street tire but nothing that will evaporate after contact with a pot hole. Basically I want to know it the rear tire will be too slim in the side-wall dept.