Tight squeeze removing rear wheel
I picked up my new-to-me '03 K12RS over the winter and am just now able to start putting some miles on it. A couple of weeks ago, I pulled the wheels and put on a new set of tires. I noticed that it's a pretty tight squeeze fitting the wheel between the exhaust and the hub. The tire rubbed firmly against the exhaust for an inch or two. The previous owner apparently did this when the exhaust was hot because there is a baked-on patch of rubber on the right side of the can.
A few questions:
-- Is it typical for this to be such a tight squeeze? It must be even worse for those of you with a 5.5" rim and 180 tire.
-- I considered loosening, or even detaching, the exhaust hanger to allow a bit of play, does that seem like a reasonable thing to do, or will the unsupported weight be a problem?
-- Any suggestions for getting the baked-on rubber off of the can? A fingernail doesn't budge it, I think I'll have to use some solvent or chemical on it -- but what?