Hey everyone, Not a wheel tire geek, haven't found anything I can rely on with wheel sizes during a short look, I'm looking to get American racing groove vn514 wheels but not sure what would be a good combination with sizes.. as the car will be an Auto X car i want the widest possible I can fit. front and rear. I've seen a few posts saying 245/40/17's are this biggest in the front and 275/35/17 for the rear, although I've seen 275/40/18 front and 295/40/18 fit in the rear with the same rim I want. Granted I'm not sure what modifications where done to that specific IROC, so in other terms I am right where I started.... lost.
I know a little bit to know the IROC has different spacing and the wheels are staggered, but anyways need some help. TO help my car is an 85 z28 with no suspension mods YET. With an 87 GTA rear end should be the same width and spacing in the rear as i recall.


AND THESE ARE THE WHEELS I WANT

 

I used to have 275/40/17 all around. It was a great size. Not i have 275/40 18 up front and 305/35/18 rear. I have a 9 in wide front and 10 in rear. Im using nitto NT01s and they stick really well. The 305s just fit in the rear and don't hit anything.





This last one the car is lifted in the rear and the axle is shifted out slightly.

 

oh sweet! any back spacing? are you rubbing around corners? are you saying you fit these with no modifications?