Bicycle Mechanics - Derailleur hanger bolt too tight

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playera
10-18-07, 05:27 PM
How much should a Rear Derailleur "swing" when bolted to the hanger?

I've rebuilt the hanger bolt section of the der with clean and lube. When attached to the hanger, the der doesn't rotate easily unless I back off about a turn.

Does the der need to rotate? Why might it not rotate?

Thanks

supcom
10-18-07, 09:21 PM
Perhaps you made an error in reassembly. Did you install the return spring correctly?

The hanger bolt torque should have no effect on the pivoting action of the derailleur.
playera
10-19-07, 06:59 AM
The bolt was reassembled correctly. It's just tight. It has grease and oil lube.

Soil_Sampler
10-19-07, 07:23 AM
Sounds like you need to double check your assembly. seals,c-clip,etc.
What is the make and model derailleur?

http://www.parktool.com/repair/readhowto.asp?id=76
playera
10-19-07, 08:15 PM
The derailleur is an old Shimano from 1986, no name.

I really think it was reassembled correctly. It was tight to rotate before disassembled. And, should the derailleur swing very easily?
Soil_Sampler
10-20-07, 01:44 AM
Pivot is spring loaded.
After the bolt is torqued to spec. it should rotate without binding and spring back into position when moved.
playera
10-20-07, 07:50 AM
Thanks. That's how my other bikes are. If this ever gets loosened up somehow, I'll write back.