Ultegra R8000 Chain issue

wotnoshoeseh
wotnoshoeseh Posts: 531
edited August 2018 in Workshop
Not easy to explain this one, but when pushing on in the small ring, and in the higher gears on the rear cassette, if I stop pushing the pedals, effectively the chain goes all slack on the top side of the drivetrain- it's as if the cassette still is being pushed around and pulls the chain through the pulley wheels, and slackens the chain between the cassette and the chain rings. Then the spring on the derailleur pulls the whole lot back into tension.

Any ideas gratefully received?

Comments

  • Vino'sGhost
    Vino'sGhost Posts: 4,129
    That’s what happens when the free hub sticks. Remove, clean out the gunk and put back together.
  • wotnoshoeseh
    wotnoshoeseh Posts: 531
    There's just over 1000 miles on it. And all in great weather....

    Just watched this....https://youtu.be/IMlARo8AiFM

    But I'd be surprised if I needed to replace the bearings in the body, with so little miles.

    Could it be dragging pawls?
  • Vino'sGhost
    Vino'sGhost Posts: 4,129
    Yes could be dragging you described the symptom
  • mitchgixer6
    mitchgixer6 Posts: 729
    Definitely sounds like a sticking free hub. Worthwhile stripping it to have a look. Just because it's new doesn't mean there can't be a problem manifest somewhere.

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