I had thought the 914-6/GT was the major reason Porsche produced 7r's, even though we all assume they come from the 911 R or fronts on the S/T (otherwise, they are VW wheels...I kid)?

I run CN36s on 6r and 7r's 185/70-15 all-around. No fender rolling. If you want the 215s in back, you need to roll your fender. The look of the square tires, stretched in back, is perfect, at least for a stock car IMHO.

Also, having autocrossed the CN36s a few weeks ago, very aggressively, they are phenomenal tires. So much better than the sprint classics. I honestly can't imagine needing more meat driving on the street. At this point, brakes are the limiting factor on my street car.