Wobbly back wheel... what should I look for?

[RedBaronX]

Alright, I am finally doing some ASSEMBLY on this thang-- I had to loosen the rear derailleur to get the back wheel off (seven speed) to put on the rear sprocket... ok well I now have everything back together, and I'm tightening the rear sprocket to get it into lateral true... and no matter how much I tighten and try to balance it, it's still out of lateral true...

so I loosen everything up and try to better straighten the sprocket, and it's as close as I can get it... and then I realize the whole back wheel is wobbling! I can't get the sprocket straight because the back wheel isn't!

I loosened the back wheel up, play with it, pedal it real fast to try to get it to straighten and true itself, and it doesn't seem to get any better...

The rear derailleur is also now kind of skipping, but not in QUITE the same place (so I don't think it's a kink in the chain). it skips a little after each complete revolution of the pedals.

Suggestions of what I should be looking at to straighten the back wheel?

It's off of lateral true by maybe at least a millimeter...

 

[porsche930dude]

the wobbly wheel has nothing to do with the derailer and skipping chain. If the wheel is just a tiny bit wobbly your probrobly better off leaving it alone. Just get your motor sprocket as straight as you can and the derailer adjusted right. the skipping chain is probrobly due to the out of adjustment derailer or possibly the chain has a spot in it that doesnt flex so good. So make sure its all moving freely. The derailer has two detent adjustment screws on it aswell as the cable adjustment. Sometimes when you take it off it doesnt all go back where it usto be so it needs to be adjusted

 

[RedBaronX]

I took everything (mostly) apart again... the hub had loosened itself. Tightened that back up, put everything back together, and already the derailleur was rolling more smoothly. Also the sprocket is rolling probably as true as humanly possible. There is still a little bit of wobble while it coasts, but everything spins pretty true as I turn the crank.

This shouldn't have taken as long as it did... glad I didn't assume I would get everything done on Sunday...

 

[sgtmonkeynads]

How long did it take you ?

It took me all day. My buddy that was helping gave up after the third attempt and shampooed his carpets instead. I want to find the guy that can do this in two hours.

 

[Chalo]

How long did it take you ?

It took me all day. My buddy that was helping gave up after the third attempt and shampooed his carpets instead. I want to find the guy that can do this in two hours.

A qualified and experienced bicycle mechanic could overhaul your hub, detension and retension your wheel, total up your service ticket, and have everything cleaned and polished way inside of two hours.

The problem is that most such guys don't want to have anything to do with a motorized bike. It's not just because motors are "cheating" (although that has something to do with it), but more to do with the stink of the motor and the audacious, obnoxious crudity of motor kit components.

I am willing to work on motorized bikes, but the other mechanics at my shop would turn one away as resolutely as they would turn away someone who wanted them to work on a truck.

Chalo

 

[RedBaronX]

How long did it take you ?

It took me all day. My buddy that was helping gave up after the third attempt and shampooed his carpets instead. I want to find the guy that can do this in two hours.

I would have to say that beginning to end about four hours... which is ironic because I think the instructions booklet that came with the motor kit said that a person with moderate tool skills could install the whole motoring kit in about four hours... ummm, no. Now that I have done one, I could probably do a raw installation within one long day...