FWIW, I had 265/50 & 295/50 tires on 15x8 steelies on one of my Road Runners; they really filled out the wheel wells nicely, and their width kind of scaled down the car's size. But as time wore on, the short sidewalls of a 50-series started to look too short. 70 or 60 series I think provide a better, more cohesive look to my eye.