Rear mech indexing puzzle

Meds1962
Meds1962 Posts: 391
edited November 2011 in Workshop
Noticed the rear mech 'jumping' in some gears so decided to adjust the indexing, which I've done with no problem many times before (Ultegra 9 speed).

This time when I get it sunning smoothly on the bottom 5 sprockets it jumps about all over the place on the top 4 and vice versa. I changed the cable but the problem is still there, nothing is damaged as far as I can see. Any help appreciated.
O na bawn i fel LA

Comments

  • nicklouse
    nicklouse Posts: 50,675
    bent mech hanger?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • nakita222
    nakita222 Posts: 341
    nicklouse wrote:
    bent mech hanger?

    +1

    Or the spring in the rear derailler may be a bit gunked up. Give it a clean and lubricate it with some teflon spray.
  • ratsbeyfus
    ratsbeyfus Posts: 2,841
    When I had this problem it turned out that the rear mech (not the hanger) was bent. Good luck tracking dow the problem.

    I had one of them red bikes but I don't any more. Sad face.

    @ratsbey
  • goosey
    goosey Posts: 103
    Recently spent ages trying to trace a similar problem which turned out to be a broken upper pulley (jockey)

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