Ok another fitment question:
C5 z06 wheels
Front: 18x9.5, 56mm offset, 7.45" BS with a 255/45 18
Rear: 18x10.5, 58mm offset, 8.03"BS with a 295/45 18
Tires:Nitto NT555
3rd gen rear
With 2" spacers all around, will this combo work? Anybody run a similar set up? Any clearance problems in front or rear? Car is not lowered, I have an Adj panhard bar. Mostly street car with over 500 hp at the wheels. These good tires for traction? Waiting on the 4th gen 9" so I'm not worried about the KABOOM on launch.
Should I go with a 17 for more sidewall flex for traction?

2 Inch spacers will be perfect for the front, but wont be needed for the rear since you are going with a Fourth gen rear end since they are 2in wider that 3rd gens. Not sure about about the NT555 question since I have never used Nitto tires.

3rd gen rear yes with spacers, 4th gen rear no spacers. Im running 2.25 front & 2.5 rear spacers. I like it gives the rear a lil wider look.

With the Skulte formula: (width/2)+(offset/25.4)+.25- max back space= adapter size, I'm coming up with a 2.25 for the front. To continue to beat the horse, since Skulte is no longer around, what adapters/spacers are you guys using? Do the adapters/spacers need to be hubcentric or lugcentric? What is the diameter of the hub? I have read 70.6mm. Is this correct? I have also seen 70.3?