If you can shake it side to side the bearing does indeed need adjustment. If it's solid when you try to move it side to side but wavers at the brakes when turning it's spokes/rim. If both of those are OK but the tread on the tire moves back and forth the tire needs attention. In any case, don't watch out for it, have it fixed!
Last edited by cny-bikeman; 05-11-13 at 01:53 PM.