I have a 2003 which has recently developed a lot of wear on the outside edge of the passenger side front tire. It has been a while (15K miles) since I rotated the tires, so I did a rotation. While doing the rotation I notice I could wiggle the same tire side-to-side a few mm. I checked the driver side tire and it does not wiggle. I am not sure if this is a bearing issue or some other component. Any guesses as to what the issue is and/or what I should be doing to diagnose the issue? Thanks!