try the wheel+tire on the front or different sides to see if it still makes the noise and if you can still feel it kinda wobble. if it's still coming from where it was before, you could have a bent or warped the bearing that goes between your axel and your wheel. they're not too expensive or easy to replace. my right rear used to do that, and i dcould find out what was wrong. apparently i hit a pothole and bent the bearing. also....always use centercaps or hubs to cover your bearings so that they dont corrode or rust.