My guess is that the turning radius is reduced as a result. For a street car that is bad, but for a track car I don' t think it matters that much. How many street cars run a 10.5" wheel with 315 in the front anyway?Very cool, but I don't understand how that much tire will fit inboard. My 65 with 235's rubbed on the steering box bolts, how would you fit almost 2" more tire ? I guess with perfect backspacing, mine had some room outboard ... I'd love to see a demo install on an early car.