Well, you have to factor in ride height, the strut setup, and of course the offset of the wheel. I think if you run an 18in setup with 215/40's on 42mm offset with stock height and revised struts, you'll be okay. I think if you run 40mm offset, your car might shimmy a little (I wouldn't know, I'm just working the college physics here). . .I think the struts are a big issue, since Ford has a tendency to install supple, bouncy struts, and that'll lead to rubbing. If you've lowered your car, then I wouldn't be surprised if you rub all over the place. BUT, if you have good, sporty struts, you'll be able to clear those 18's. . .I guess you have to plug and play, problem is most of us on this forum are a bit budget concious, so there's only so much room to play, right?
Pascal's car, you can see it under the pic section, he just sold it, he's running 18X8.5's with 225's on his CSVT, no rubbing ever mentioned.
I'm going to try the OZ's when I have enough money: The Superleggera's with 215/40's, but I raised my car back to stock height since Houston has parking ramps at 40degrees everywhere (flooding issues), and I was scraping up the underside like there was no tomm.
Suneil