I've got 18x10s w/275/40s, 6inch backspacing was ok 'till I went to the 12-bolt which was 1 inch shorter and had to add 1/2 inch spacers and longer studs just to center the things in the fenderwell again. I rolled the lips and the sidewalls only rub a little on the insides on a high lift of one end of the axle. The rear Hotchkis bar helps alot. I tried 19's and I agree they are just too much trouble and the tires are much more expensive. My fronts are 17x8's for a little rake. I've seen 18's all around and it looks like the car is going uphill, I think it's the shape of the fenders or something...might look better on a Camaro though.