Quote Originally Posted by 01mmmz28
I have the 18" Zo6 rims. I love the looks, but it did slow me down a little. Performance was hurt because of added weight and the fact that the tires have a much lower side wall because of the 18" rim and that gives me less traction at the track, and on the street. I am running 275/40/18 ZR tires, that is a decent amount of tire and I still cant hook up real well.
The sidewall height on a 275/40/17 is exactly the same as on a 275/40/18. 110mm (275 x 40% = 110).