Wondering what is the widest 18in rim that can be put on a E30 M3 with rolled fenders and quarters.. I have several sets and was hoping I could use one of them, unstead of buying another set just for the track.. Thanks Guys!!!!!

I wouldnt run anything bigger then 9's in the front and maybe, squeezing a tire on there a 10 inch in the rear. Not a professional, just what I have heard and read on the topic.

i once ran 18x9 all around with 225-35 upfront and 225-40 at the rear. you can go wider at the rear but the thats as far as you can go with the front without the rubbing problems while turning....