Close to making a decision on some wheels and was looking for some comments. Looking at 17x7.5 w/ 215/40/17 up front and 18x9 w/ 255/35/18 out back (Moda R8) These sizes seem to match up well when looking at sidewall height. Most combinations I could think of had a much bigger sidewall on the 17 then the 18 and I thought that might look odd.
My other option is going 18x8 w/225/40/18 up front and 18x9 w/255/35/18 out back (ASA AR1).
The biggest concern beyond look is that the combination fits. I'm currently running 16x7 w/ 225/50/16 and I just had HR sport springs and Koni shocks installed. It's sitting right on top of the stock wheels so I'm concerned about going too big.
Reply » Opinions on 17's in the Front 18's in the Rear
the diameter of the wheel and tire shouldn't be a problem as long as you upsize correctly (more rim, less tire). Funny, I'm actually considering the same wheels (ASA AR1s). I like the styling, decent weight, good price. BBS doesn't make many that'll fit our Zs...these are a definitely a good alternative - please post pics/impressions if/when you get them?
as far as the 17/18in combo. dp did it:
i think it's a matter of taste - i think it looks pretty hot. if you're considering it out of necessity, however, i would venture to say that you'd have no rubbing problems with 18x8 up front. i know that some have had difficulty w/ rubbing on Zcoupes w/ suspension and 18x8.5 up front....