There isn't much clearance, but I don't think there needs to be. I have about 3/4 inch on my 225's. But a 215 is only slightly wider than a 205, and only half of the increase is on the outside, against the fender skirt. If you are concerned, the sketch in post #1 here may (or may not) help.
http://www.trailmanorowners.com/foru...ead.php?t=6245
Bill