I have a 2003 Redline Monocog. I just had it at the shop the other day, because I noticed some minimal side to side movement in ther rear wheel after cleaning the bike the other day. I got it back yesterday, rode and it seemed fine. After tonights ride, it seems to have come back, I don't witness the side to side movement, but can hear it moving back and forth when I try to and then when I set the bike down, it seems to feel loose then too. Someone suggested it may be a bad freewheel, any ideas or suggestions?