5

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.

3
  • 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.
    – Dan
    Jul 30, 2014 at 4:09
  • 7
    Lubricate the pivot of the derailleur. The behaviour you describe points to a sticky axle.
    – Carel
    Jul 30, 2014 at 18:36
  • @Carel why don't you post it as an answer?
    – Alexander
    Oct 13, 2015 at 8:57

2 Answers 2

2

If I understand you correctly, you don't have a B-Tension issue. B-Tension sets the clearance between the upper derailleur pulley and the chain, and should not be used to add spring return force to a derailleur.

In this case, I believe that the derailleur pivots are in need of cleaning and lubrication, and I would start there.

If that doesn't fix the issue, you can look at replacing the derailleur return spring (#2 in photo)behind the fixing bolt of the derailleur and/or the cage spring (#1 in photo)between the derailleur body and the derailleur cage.

6700 exploded view with annotations

Ultegra 6700 RD Manual

Exploded View PDF

1

Assuming you have already backed the B-tension screw all the way out, I believe your B-tension spring has simply lost its tension. Mine is the same way. I know that spring is replaceable in some derailleurs, and checking whether it is in this one is on my list of things to do. Check with your local bike shop.

1
  • 1
    It may be, but the first thing I'd check is that the derailer pivots freely on the axle (as @Carel mentions in the comment above). If it does, then check that the spring tension is still there.
    – dlu
    Nov 12, 2015 at 5:56

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.