wheel alignment
Sounds like you might be missing the inner spacer on the sprocket hub/damper assembly. It tends to stay in the assembly when you pull the wheel off, but if you lay the assembly (separated from the main wheel hub) down or bump the assembly while off the main hub it can fall off an roll away. Far away. Trust me on that one. I just spooned a new tire on today and dropped the sprocket/damper assembly and the inner spacer jumped out and rolled out of my garage, down the driveway and out into the street. Without it I'm bettin you could trash yer bearings and/or hub........Randy