I want to install 17x8 or 18x8, both with a 25mm offset, rims on my Justa, but I was also wondering what is the widest rim size I can go before my wheels start to rub on the fenders when I turn? I'm planning on getting 215/15/40 tires.

 

I assume you mean 215/17? You can certainly use a 7" or 7.5" with that size tire. You're really going to feel the extra rotational weight of a 17 or 18 so you may as well save some weight where you can with a slightly less wide wheel.

 

Yeah 215/17 I currently have 215/15/60 which threw me off. Well Ive seen CS's with an 18x5 and I figured and extra three inches wouldnt hurt too bad