On a ride prior to taking the bike in I noticed some rubbing on the rear brakes when standing in a climb. The mechanic said it could be because of hub issues. After the overhaul, the rubbing is still there and is just as bad as before. The rear wheel looks true (it's a Mavic Kysirium SL, a couple of years old). My hunch is the wheel is flexing more than it should. Does that sound reasonable? I'm hoping it doesn't have anything to do with the frame (Seven Axiom SG). Any ideas on what to look for here?