Any other 1st Gen G's out there running the G37x coupe 18's?
 

I just installed mine yesterday. These are the staggered split 5-spoke design, 18x8 in front with 225/50/18 rubber and 18x8.5 in the rear with 245/45/18 tires; couldn't find offset info. My question is--for the most part, it drives fine, but over unusually heavy bumps (e.g. railroad tracks), it rubs. I'm guessing I need spacers for the rear? If so, any recommended size? If anyone already has this setup, are you running spacers? The wheels already stick out to the fender, so not sure how much further I'd need to clear suspension (I'm guessing it's a suspension rub here and not a fender rub, as my car is not lowered, has stock sport suspension). I'd take pics, but wife has the camera. Perhaps later today I'll post up...Thanks in advance!

I like those rims better than the g35 coupe 18"s. They would look sick powdercoated

your side wall is way to big. I would run 225/40/18 and 245/40/18 for a staggered set up.

Thanks. I was starting to lean towards that conclusion, seeing how the wheels actually barely stick out from the fender in the rear, and I have about an inch of clearance between wheel and fender. I bought this as a complete set off a 2010 G37... I don't go over bumps that rub to often, so I may just wait until these rears wear down and replace with 235/40/18s. The tires are practically new.

I know you have that setup on your car, but in my opinion it's too small unless you're lowered quite a bit. The differences from the stock 215/55/17's are:

225/50/18 +2.02%
245/45/18 +1.39%
225/40/18 -4.68%
245/40/18 -2.29%

I would go with something like 225/45/18 in the front and 255/40/18 in the back. Those are only -1.3% and -1.07% different than stock. The 255's may be too wide though if you're already sticking out on the sides.

Also, the offsets on those wheels are probably similar to the 350Z anniversary 18's. I think they are +30 in the front and +33 in the rear. You need to figure out where it's rubbing before you decide on spacers or not. If it's the fender, spacers will make it worse. I think smaller tires will fix the problem.

225/45/18 F and 245/40/18 R are the stock sizes for g35 coupe 18in OEM sport rims.

yep, I'm beginning to think it's the fender that it's rubbing against. I looked over the whole wheel well and the tires sit closest to the fender. Anyway, normal everyday driving, it's fine, even over cracks and bumps. Just need to take it easy over the ridiculous ones. Went back on the road that I rubbed on yesterday, took it slower, and was ok. Have to get used to it I guess--til the tires wear out. :D