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I've noticed that my rear derailleur (Ultegra 6700) will not return to where I've set the B-tension adjustment. Pulling it away from the hanger means it will just stick there, or maybe move back a little bit. Comparing to other bikes with Shimano rear derailleurs, mine seems to be odd one out.

It mostly causes annoyance when removing the rear wheel -- I have to push the derailleur back "in" afterwards, instead of relying on it just naturally going back to the correct position.

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Have you tried shifting to you lowest gear and then checking the actual cable tension? It may need to be pulled through a small bit. –  Danly_Dan Jul 30 '14 at 4:09
Lubricate the pivot of the derailleur. The behaviour you describe points to a sticky axle. –  Carel Jul 30 '14 at 18:36

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