I finished up my birf job a few weeks back (for the second time) and just replaced the front wheel bearings with Mobile I Synthetic. While driving on the highway the Cruiser drives like a dream, but when I'm on a bumpy road, the thing is all over the place. I thought it was loose bearings, so I checked, and double checked to see if they were loose - nope. I just got new tires too and it hasn't been realligned since then. Could this be merely an alignment issue or something more ?