Campag gear fine tuning (slow to move to small cog)

TEGS1
TEGS1 Posts: 3
edited January 2013 in Workshop
On the middle sprocket on the rear cassette, it is slow to move down to the next smallest sprocket. Do I adjust the the barrel adjuster on the rear mech while in the problem sprocket or do the adjustment when the chain in on the smallest spocket on the rear cassette?
Ps: The chain moves up and down fine on the cassette, except this one exception.
Any ideas?

Comments

  • bondurant
    bondurant Posts: 858
    IIRC Campagnolo advice is to align in the middle cog of the cassette to set up indexing correctly.
  • giropaul
    giropaul Posts: 414
    If it's in adjustment over most of the cassette, I wouldn'tdon't touch the barrel adjuster.

    Check the adjustment of the wrap-around (very small screw on the bottom pivot of the mech - where cage that holds the pulleys joins the body of the mech). Look on-line for diagrams.

    Also check that the cable is running freely, and that the correct spacers are in the correct places in the cassette.

    If your ergo levers are at the lower end of the range, then the mechanisms wear quite fast, and if this is a change you make a lot then it could be that the ratchet is worn.

    If the cassette has been used some time, and you use the middle sprocket most of the time, it can even be that the teeth are "hooked" and hold onto the chain more than they should.
  • TEGS1
    TEGS1 Posts: 3
    Thank you for the advise, the bike is 8 weeks old from Ribble. I have already replaced the cable as the bloke at the my local bike shop said it was the way the cable was routed.
  • giropaul
    giropaul Posts: 414
    If the LBS has already had a look at it and it's only 8 weeks old I'd suspect the spacers in the cassette. It's not hard to get some in the wrong order, especially on some cassettes.

    Actually, I'd probably just take it into Ribble and ask them to sort it!
  • g00se
    g00se Posts: 2,221
    Bondurant wrote:
    IIRC Campagnolo advice is to align in the middle cog of the cassette to set up indexing correctly.

    I think it's with the chain on the large chainring at the front and the forth sprocket in from the dropout at the rear (for 10 and 11 speed - it might be the third for 9 speed). In that position, the chain line is straight and in line with the large chainring - so it's easiest to line your eye up along the plane of the chain to check that the position of the top jockey teeth is dead in line with the teeth of that sprocket.
  • bondurant
    bondurant Posts: 858
    And you're right! More or less. 5th sprocket from smallest for 11 speed, 4th for 10 speed.

    Page 5: http://www.campagnolo.com/repository/documenti/en/CAMBIO_UK_10_12.pdf

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