thank you everyone for all the help. i have sc430 wheels and want to go as wide as i can with tires, and as big as i can go with profile. wheels are 18x8. 2000 ls. stock. i have been told that i need 15mm spacers in the front. i am thinking 255/45/18's in the front and 265/45/18's in the back. can i go any wider without rubbing? thanks again as always