Streetracer, I have the 18/19 combo on order. I opted for the 10.5" rim in the rear for exactly the reason you are talking about. After talking with HRE, they said that the 11" wheel would stick out a bit in back when the tire was mounted on it. Talk to Renee at HRE. At any rate, this might look a little funny, especially with a noticably deeper rim face in the rear. I would suggest considering the 10.5" rim unless you really don't mind the big difference front to rear, and it sticking out a little more. Also, with a 275 tire in front I would imagine that the rims, especially 19's, would rub the inner wheel well when turned all the way, but I don't know for sure. 265 would probably work best. My attitude is better safe than sorry, so I'm sticking with the factory rim width (9.5" F/ 10.5" R) and tire combo, and then compensating for aesthetics by adding one inch in overall diameter to the face. Whether you do 19's all around or an 18/19 combo is purely heresay, but I like the offset just because the car was built to handle this proportion. Good Luck. BTW, I don't have my rims, but I do have my tires, and they are huge, you'll be impressed!