Generally, you don't want your wheel to be any less than 80% of your tires width for propper support.
So if it fits, 225 is the
max width I would go with on a 17x7 (the SVT Focus wheel). You'd probably be better off with a 215 though...
Which brings up a question I've always had:
Why did SVE decide on such wide tires on a 6.5" wheel? Did they really want to stick with KDWs that didn't come in the smaller width at the time? (BTW, the KDWs will be out in 5 additional sizes soon. Hopefully some 215/45/17's

) Any ideas?
Here's a pic of the wheels:
http://209.132.49.149/images-large/2001_ford_focus_svt-1.jpg ------------------
00 Ford ZX3 / 96 Ford Cobra
90 Yam FJ1200/ 85 Yam RZ350 / 84 Yam RZ350