I was cleaning the bike (2004 KRS) today and noticed a slight irregularity in the rear wheel lip on both sides. I've had a couple of sets of tires already, so I am wondering if the rim was damaged in the installation process, or if it could be a factory irregularity. It is only slight, and has no visible scratches or otherwise. I can't feel any vibration or anything - should I worry about it and see if it might be a warranty issue, or let it go? Anyone else noticed similar in their rear wheel?