I have a set of GTA wheels and a set of 15" Convo Pros. My rear GTA wheels are widened to 8.5". My rear Convo Pros are only 7.5". I was planning on keeping both sets of wheels. One for the road and one for drag, but I don't drive the GN that much and I can smoke the the Kumho 255/50/16's street tires from a 70mph roll. I'm thinking to sell the Convo Pros and get some Toyo Proxes drag raials (175/45/16) on the rear and use those universally.....or take it easy on the street and put some M/T 275/50/15 DR's on the rear of the Convo Pros when I want to have fun. Looking for opinions.