Yes, the extra aspect ratio will smooth the ride out some more, but it also depends on the tires you put on the car - some of them will have more road noise than others.

AFAIK, the 245/45-18 is the standard size tire (and also the standard wheel size) for the X models. Someone must have replaced the wheels on your car, I guess.

Are your current 19" wheels also the Infiniti Sport OEM wheels? If so, then finding somebody with the 18" Infiniti OEM wheels to trade with is a bit easier!

Z

Trust me when I tell you the almost limitless assortment of tires you have to chose from will be huge and way cheaper. The problem with 19's is they are expensive and limited.

Grab some 245/45/18 Falken 912's and life will be smooth, inexpensive, AND sporty in terms of driving prowess. Grab some Michelin Primacy's and life will be smoother than you could have imagined.

The combination of more sidewall and GREAT tires will have you wondering why you didn't feel the bump in the road. I have driven on the Falken's and I'm telling you those things are awesome!!!

http://www.finishlinewheels.co...87U78/

I havent purchased from them myself but i can agree to the 19's getting damaged easily. I have a rim messed up by a pothole and to repair will be 150 + balancing, it got pretty messed up. Ne way hope the link is helpful to anyone in need of a new rim(s).