Can't remove rear derailleur

zhang Posts: 222
edited December 2012 in Workshop
I'm trying to get my rear derailleur (shimano 2200) off to service/replace it. The top pivot (I think they call it the B-pivot?) is seized and won't more freely, which is giving me problems. The problem is, when I use the allen key to loosen the derailleur mounting bolt it moves about 1/3 turn and then won't budget. I'm concerned that if I put any more pressure on it the derailleur hanger will bend! ... 3%2001.jpg ... 3%2021.jpg

So that's pretty much what happens when I turn the allen key.

Any ideas guys?


  • Monty Dog
    Monty Dog Posts: 20,614
    I't unlikely you can exert enough force through a regular allen key to damage the gear hanger - probably some light corrosion on the threads of the mounting bolt. Remove the rear wheel and spray some WD40 or GT85 on the threads, let it soak and try again.
    Make mine an Italian, with Campagnolo on the side..