20/21 wheel set up ride quality?

[Blown SRT]

11.5 is much better IMO. This is a Supercar NOT a stanced Lexus. I also feel if you're going to replace the OEM forged wheels, at least replace them with a light weight one piece forged setup. once again... just my opinion however.

I used 12" Vorsteiners with a P Zero 325/25/21 out back...and the sidewalls are straight, not stretched more than the OEM setup. It also depends on the tire you use...a 325/25/20 (or any size) will be quite different from model to model, brand to brand.