have you looked at the wheel bearings? they are regular ball bearings pressed into the outside of the wheel. you should be able to see the outer race and dust seal, along with the tube the axle goes through on the swingarm. there should be NO GAPS. if there is a gap, your bearing is probably toast. if you bearing has been screwed up long enough to affect tire wear, your wheel might be done too. luckily you can still get new ones.
alteratively. your axle should not be sticking out at all on the right side.
I was also reminded of this post
on badweb, but that was on the front wheel. That points to an alignment issue. but there isn't anything that should affect rear alignment short of something important being bent.