Weird Chain jumping in 4 smallest cogs in rear cassette... super strange.. need help

Discussion in 'Cycling Equipment' started by mammajama83, Aug 7, 2006.

  1. mammajama83

    mammajama83 New Member

    Joined:
    Jul 7, 2006
    Messages:
    11
    Likes Received:
    0
    i have a full ultegra set up and i am having problems in my 4th through first largest cogs on my rear cassette, the problem is, the chain keeps jumping and i am having ghost revolutions of the crank, which in turn kills my cadence and momentum, i have checked the rear deraller, and made sure it is right on , and i have examined the rear hub and cassette, now there seems to be a little bit of a shimy in the cassette, but nothing to bad... furthermore, it really only happens when i ride the bike, it wont do it when i have it in a stand, what coul;d cause this, and how can i stop it... thanks



    thanks
    Phil
     
    Tags:


  2. Bob Ross

    Bob Ross New Member

    Joined:
    Jun 22, 2006
    Messages:
    363
    Likes Received:
    4
    My wife has this problem with her Ultegra rear setup, in the 4 smallest cogs. After 3 different mechanics futzed around with her rear derailleur to no avail, mechanic #4 determined that a cam in her shift lever wasn't grabbing the cable solidly, so that over time and after repeated shifting the cable would "slip", causing the RD to shift when she didn't intend to...or not shift when she really intended to...or half-shift...

    Still awaiting final resolution, but it might be worth looking into in your situation.
     
Loading...
Loading...