I have 4° caster, so technically my tire should be closer. Each side measured within 1/16 inch on the closest distance from tire to fender with wheels straight ahead. If you factor in the difference in tire height, I'd have a minimum of 2" gap. (Measured to fender opening, not the bolt head).
On the closer side, with the wheel turned I still had .175" gap (again tire diameter factored) on the shorter of the two. To just the fender opening, I could put a finger between either side.
What I can't figure out, is why yours has that much variability with the tire turned.
