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Shifting up jumps all the way to smallest cog

Discussion in 'Bicycle Mechanics and Repairs' started by Tin Pot, 5 Jan 2017.

  1. Tin Pot

    Tin Pot Veteran

    driving me nuts as I'm supposed to be training.

    Haven't played with the rear derailleur since flying back from Ireland and I rmembemr someone advising on this problem.

    Shifting down is fine, if a little grindy.

    Shifting up clunks and jumps all the way to the smallest cog!

    Tried playing with rear cable tensioner - shifting down gets smoother but shifting up still jumps all the way.

    HELP!

    I've got 2.5hrs to do on the turbo before bedtime then up at 5:30 for another hour...
     
  2. See if you get better advice but if you don't want to be in the hardest gear you could adjust the limit screw so it stops short of the smallest cog. I've had similar in the past but not dropping down through all the cogs and it was a wire end cap beginning to snap inside the hood where I couldn't see it. It quickly snaps altogether though and whilst it will fall to the smallest cog it wont shift to a lager one. Good Luck
     
  3. Tin Pot

    Tin Pot Veteran

    Tried releasing and resetting the cable - makes no difference - so I've kind of taken your advice and set it in a gear that won't slips. I'll just have to up the cadence to get to the right output
     
    HLaB likes this.
  4. Tin Pot

    Tin Pot Veteran

    1.5hrs in. A few issues but getting through it.

    :smile:
     
    HLaB likes this.
  5. Tin Pot

    Tin Pot Veteran

    Right got some time to sort this out.

    When the rear derailleur shifts to he smallest cog, it's loosening the tension, right?

    Because if the cable is disconnected it falls to the smallest.

    So there's likely some problem with how much the shifter is releasing.

    From biggest cog, one click jumps down two. The second click jumps all the way to the smallest.
     
  6. lpretro1

    lpretro1 Über Member

    Location:
    Chorley
    Suggest u fit a new cable inner & outer
     
  7. Glow worm

    Glow worm Guru

    Location:
    Near Newmarket
    New inners and outers is a good shout. Don't forget to adjust the barrel adjuster as well. I found this video useful.

     
    Slick likes this.
  8. winjim

    winjim A youth of interminable age

    Try disconnecting the mech and pulling on the cable as you click the shifter through the gears. Hold it by the downtube stop to eliminate any effects from that last piece of cable outer. You should be able to feel the cable release with each click. That should let you know if it's a shifter problem.
     
    gbb and Tin Pot like this.
  9. ColinJ

    ColinJ Climbs Hills Slowly!

    There must be a ratchet mechanism in the shifter which is supposed to release the cable by just enough per click to change up one gear. If the ratchet is worn/broken then it isn't hard to see how it would release the cable completely and cause the problem described. @winjim's suggestion sounds like a good way of checking for that.
     
    raleighnut, Tin Pot and winjim like this.
  10. Tin Pot

    Tin Pot Veteran

    This is what I've just done(!)

    Click, click...clackety.

    I've lifted the rubber over the shifter and watched it jump there too.

    Shame as I was sure it would be related to my removing/replacing the rear derailleur for those flights to/from Ireland.

    Will it be lube? A spring? Or replace (I have spares).
     
  11. Tin Pot

    Tin Pot Veteran

    raleighnut and winjim like this.
  12. winjim

    winjim A youth of interminable age

    Graeme_FK and raleighnut like this.
  13. ColinJ

    ColinJ Climbs Hills Slowly!

    I didn't know that the springs are not replaceable on later Campagnolo shifters. I have 10-speed Chorus from the early 2000s and the right shifter was losing its indexing last year so I searched YouTube and found a very good Campagnolo video showing how to service it. It is good as new now!
     
    Tin Pot likes this.
  14. Tin Pot

    Tin Pot Veteran

    Thought i had spare Veloce shifters.

    Damn.

    Knew I should've gone Veloce on my Tt instead of Athena(!) - I have spare Athena shifters...
     
    Last edited: 7 Jan 2017
  15. Adrian

    Adrian Heed the elf's wisdom

    Have you checked for anything that might be making an otherwise functioning shifter misbehave? A bit of frayed cable stuck in the cogs, that sort of thing?