Yup, mine rub the inner tub at full lock, and would
definitely contact the cans if I still had them. That's with 245s. I may have a mm or two outboard, but that tire is pretty stuffed in there.
Also if you didn't click the link above, I had to roll the lips flat and run a fair amount of camber to get enough room between the strut and fender top, along with perfectly nailing the offset. Not just a bolt on deal.
I have 255s on 9" out back, and they are virtually impossible to tell the difference even side by side. The 245 is on the left in this photo:
So I THINK 255s on a 9 would fit my car, but I have 4 245s sitting in my basement for next season so I'm not going to find out.
I guess the big point is there is a lot of room to go inboard, especially if you don't run a tire with a balloon shaped sidewall. There's not a lot of outside room on the stock offsets / Euromeister 17x7 ET23.3, especially with unrolled lips and little camber.
But when you start pushing those outer reaches of Bill V's chart, you might have to go trial and error style. Easier just to use a known good.