ive tried various different sizes to get the "look",and i believe that i have it now.i run the 245/45-16s out front and the 255/50-16s out back on the 16x8.5 wheels on all 4 corners.the car looks WIDE and so much more aggressive.all the other Z guys that have seen my car really like the setup.its so much better than the 225/50-16 on 16x7.5 wheels the car came with