I had 11" rears w/315s & 9.5" with 275s on my '89 Coupe. They were Fikse FM-5s. I called them about the Z06, and they are real good about fitment specs. They are coming out with a line of forged, CNC milled 1-piece wheels that will be le$$ than the 3-piece models. I say a 19" prototype, and it is much more "open" than ANY 3-piece could ever be. These are going to be the best looking wheels available. JMO
HarleyB
HarleyB