oh, 225/45 on 49 offset would be perfectly fine. 235/40/18 should fit on 7.5" wheels, but you would have to ask around to see if it would rub. i, personally, wouldn't risk it just because i like the idea of being given the option of changing springs in the future.
oh ok, thanks, thats what i wanted to hear. I'm hoping to get these rims soon, thinking of getting the pirelli pzero nero m&s all seasons