I couldn't find anything specific to my problem. I was trying to adjust my rear deraileur and I noticed that when my wheel spins, and the chain is idle, the sprocket wobbles a little bit. I don't do a lot of repair on bikes, so I checked out my other bike and it doesn't do it on that one. Should I be worried. I'll try to explain what parts I have. It's a Trek 1000, and I'm not sure about the wheel or sprocket. I took pictures.
So, when I have to bike upside down, I get the wheel going by cranking the pedals around. The sprocket seems to rotate every so slightly around the quick release pin that goes through the wheel (sorry I don't know what they're really called.) Also, the bike bounces a little bit, especially when you really get the wheel moving fast. I hope this is detailed enough. If there's anything missing that will help diagnose, I'll be glad to add. When I get a better camera (left it at work) I can make a video perhaps.
Thanks in advance for any wisdom.