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If you want to go with 19 x 11's (79mm) on rear, what's best on the fronts - 18 x 8.5's (56mm) or 18 x 9.5's (57mm)? Guess the 9.5's if you want the option of going with wider tires, correct? And that's why you'd go with the 11's on the rears, also?
Thinking about the F.R. C6 Z06 Motorsports for my Z51 C6.
These are 9.5x18 on the front with 11x19 on the rear. I used them with the stock Z51 tires and the fit is perfect. You could go to 275s in the front and 305s in the rear. They are CCW 505. I have the rear wheels and tires F/S at $1500. I just finished a wide rear using Z06 fenders and CCW13x19s with 345Ps2s.