I was wondering what the proper 20" Tire size is to run on the 350z? I found a set Symbolic SL1's in chrome with a 4 inch lip in the rear. The fronts are 20x8.5 and 20x10 in the rear.

 

I just did 255/30/20's on 20x9 front and 285/30/20 on 20x10 rear. This will give you a 26.02" overall diameter in the front and 26.73" in the rear. The TCS works fine. I went with Michelin Pilot Sport A/S. Feels and looks great and will post some pics very soon. I went from stock 17's and 225/235 50's and I do not feel any noticeable difference in ride except in the corners where it really hugs now.

 

I'm running a 245/35/20 on 20x9" fronts, 275/30/20 on 20x10.5" rears.