I have 235/75/15's as well on stock supension of a '90 Cherokee Limited. When you convert that metric tire size it comes out to 28.9 diameter, 9.3" wide and 7" of section height.....which suprises me because I have a 4" lift in the box ready to go on, and was gonna ask Santa for new 31's....
Just bought the thing last week, but driving it back and forth to work, no rubbing. Haven't had it in the woods yet though.....