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Kilrmy,

I talked with my wheel guy and he said this is not the car that you want to go 20's on. It's not a Benz. 19's will look fine after you drop it about an inch. Give Vick a call at the numbers I gave you. I wanted to go with 20's but you won't have that much rubber on it. Don't get me wrong, I think that 20's would fit the car perfect. But you will suffer in the ride. Good luck...

 

Here is the problem I am having - do you think they actually tune the car depending on the tires (18's vs 17's)

If so then

17" STOCK TIRES ROLLING CIRCUMFERENCE:
Front: [{(22.5/2.54) x 0.50} x2 +17] x 3.14 = 81.194
Rear: [{(23.5/2.54) x 0.50} x2 +17] x 3.14 = 82.431

18" STOCK TIRES ROLLING CIRCUMFERENCE: (your calcs didnt test)
Front: [{(22.5/2.54) x 0.45} x 2 + 18] x 3.14 = 81.55 inches
Rear: [{(24.5/2.54) x 0.45} x 2 + 18] x 3.14 = 83.77 inches

So what do I start with even? My car shipped with the stock 17's but I am going to 19's, do I get 275/35s - 285/30s, they are going on a 19x10 rear

G35 Coupe / Premium / Nav
Ivory Pearl / Willow Leather
SSR GT3 19"s w/ Bridgestone SO-3