Found it! So about a month ago, I was cleaning my rear wheel rim, not that you have to with these blacked-out deals! So much better than Chrome!, but anyhow, I noticed one of those wait things they put on the rim when balancing tires, had came loose, I pulled it off, clean the rim, and put it back on with 3M tape two-sided, actually a little surprised that it even lasted for the last couple thousand miles, but it was rubbing up against my brake caliper, and it was kind of shaved down like it had been happening for a while, I guess I got to get some type of a sticky putty to put on that puppy? I've heard before that those balancers don't really mean crap, thoughts? Just take it off?