hiya. this is gonna sound like a complete idiot question but i am really kinda stumped.
i have bike. the bike has a rear wheel. when i put the bike and the wheel on the bike trainer today i noticed that in a certain gear i could hear a clicking/thumping sound, and felt it through the pedals. i thought at first it was the BB but by concentrating on the rhythm found it to be the rear wheel. this drew my visual attention thither and i noticed that the rear hub oscillates up and down on the freewheel side. (the FW dances a bit too but i know that's normal) i made sure the hub was moving and not just the FW. preliminary diagnosis--bent axle.
so...i pulled the axle tonight and rolled it on a flat surface. it really didn't seem bent. so i reinstalled and of course the wheel's behaviour hasn't changed a bit.
so, is it possible that the axle is bent enough to do that to a wheel but not enought to see/detect? AND--is it possible the innards of the hub are buggered up somehow? the cones? the bearings? the hub really looks fine. the way the wheel is acting on the bike really says bent axle. ie: the axle stays still while the hub oscillates around it.
i appreciate your help! mark