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  1. #1
    RoadBikeReview Member
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    Campagnolo geniuses needed

    Here is the conundrum.

    Brand new Record 10 Chain

    Brand new Record 10 chain rings

    Brand new Record 10 cassette.

    Everything is golden and it shifts like a champ, except under power the 12T skips on every pedal stroke. Been working on this for 4 hours and I am losing my mind.

    Checked the limit screws- lines up perfectly.
    Checked the torque on the cassette- exact.

    What am I missing?

  2. #2
    but thinking about it
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    Does it skip off toward the 13, or toward the outside? What's the chain line look like and is the front derailleur right against the chain?

  3. #3
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    Hard to see which way it is jumping as I cannot duplicate the problem in the stand, only when I am putting the power down.

    The chainline is smooth and direct with a small 1/16+- gap between the front derailleur.

  4. #4
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    Quote Originally Posted by El Scorcho View Post
    Hard to see which way it is jumping as I cannot duplicate the problem in the stand, only when I am putting the power down.
    How much power? Does your frame flex a lot? Do you get the skipping both on the left-leg and the right-leg stroke?

  5. #5
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    At cruising speed there is no problem. Hard effort or standing and it is every pedal stroke with the right leg.

    Bike is a Pinarello Paris. Not a lot of flex.

    To answer an earlier question, it looks to jump slightly toward the 13t.

  6. #6
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    B Screw Adjustment?

    I had a similar problem and solved it by adjusting the B screw.

  7. #7
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    Don't rule out a defective part. It could be something as simple as a stiff chain link that will disappear with a little more use.

    I assume that you know how to set the chain length properly, using the little/little method.

    I also assume that you've tried some minor adjustment to the shift cable tension and/or the small cog limit screw.

    I also assume that you're not using the little ring with the 12T cog when this happens. If so, then it's a chain-line issue.

    The B screw only affects the clearance with the upper jockey pulley, when the chain is on the larger cogs.

  8. #8
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    Quote Originally Posted by El Scorcho View Post
    At cruising speed there is no problem. Hard effort or standing and it is every pedal stroke with the right leg.

    Bike is a Pinarello Paris. Not a lot of flex.
    Probably not but, if you get skipping only on one leg, there's definitely flexing involved.

    Quote Originally Posted by C-40 View Post
    I also assume that you're not using the little ring with the 12T cog when this happens. If so, then it's a chain-line issue.
    Excellent point. According to the OP, we have the chain trying to move towards the inside. Might well be an issue of a borderline viable small-small gear combination. In that case the answer is simple: Don't do that. Regardless of anything else, you really should avoid hammering it in one of those extreme combinations (small-small or big-big). Things depend a lot on your specific geometry. On my Felt F1 (56cm) frame, fully crossed combinations work fine, on a different frame they may not. On the OP's frame, if that is the issue, the combination almost works, but not quite.

  9. #9
    but thinking about it
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    And are you sure the rear wheel is clamped correctly?

  10. #10
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    C-40 FTW!! LBS had a new Centaur cassette, I installed it and shazam! Problem solved.

    Must be a defective part in some small way.

    Thanks for all the input, I tried everything you recommended.

  11. #11
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    Shift issue possibility

    Quote Originally Posted by El Scorcho View Post
    C-40 FTW!! LBS had a new Centaur cassette, I installed it and shazam! Problem solved.

    Must be a defective part in some small way.

    Thanks for all the input, I tried everything you recommended.
    If you are not careful, it is possible to put the last cog on the cassette body incorrectly. This may be why the new cassette worked?

  12. #12
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    I removed and reinstalled that cassette 4 times. I am not perfect but I will bet I didn't do it wrong 4 times.

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