Tires for GT500
I put a set of M/T 305/35/18's on the back with the OEM wheels and they worked great, no adjustments needed. These were drag radials I used at the track and they were pretty smooth on the road. I recently put a set of NITTO NT555R's on the back and they are 305/45/18. They look really good, a little taller tire than the M/T's, and they fill the wheel well up without needing any adjustments to the car. If you are going to run the car, stay away from the NT555R's as they do not hold the track if you are pushing a lot of horsepower. Hope this helps. Of course you could always blow 1600 bucks and get you a set of Bogarts (wheels and tires) for the back that work great. You just can't drive them on the street.