Skips on rear cassette
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  1. #1
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    Skips on rear cassette

    I was riding today, and I had 2 skips on the rear cassette. The first was near the beginning of the ride, and the second was around 18mi later. When I say "skip" I mean that I press down on the pedal, and it feels like the chain jumps or slips. It doesn't change gears, it just slips forward. I've had one or two skips on the last few rides.

    The chain and cassette are clean. I lubed them with RockNRoll Gold before today's ride. Each have approx 600 mi, so I don't think it's excessive wear. The drivetrain is Ultegra R8070. The bike is a giant TCR Pro. I know that the chainstay is 5mm shorter than what Shimano recommends. Could this cause the problem?

    I measured the chain according to Shimano's directions, but do skips indicate that the chain might be too short? Or too long?

    Thank you.

  2. #2
    'brifter' is a lame word.
    Reputation: cxwrench's Avatar
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    Chain 'length' has nothing to do w/ skipping as you're describing. If the chain/cassette are new it's either:

    Not the cassette, but the chainring.
    Derailleur improperly adjusted.
    Derailleur hanger not aligned.
    I work for some bike racers
    I've got some bikes, some guns,
    and a bunch of skateboards

  3. #3
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    Stiff link in the chain? I would think that it would show up sooner than 600 miles. Be sure to check the quicklink/connecting pin too.

  4. #4
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    If CX's advice checks out is it possible that the freehub pawls are dirty or sticking and the freehub is slipping for a bit before it catches? Only ask because I had a similar issue once with a lower grade hub.
    In reference to the Assault on Mt Mitchell...
    Quote Originally Posted by merckx56
    The easier solution is to find a biker bar in Spartanburg the night before, go in and pick a fight. The ass-whipping you'll get will be far less painful than the one Mitchell will give you the next day!

  5. #5
    RoadBikeReview Member
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    Quote Originally Posted by ogre View Post
    Stiff link in the chain? I would think that it would show up sooner than 600 miles. Be sure to check the quicklink/connecting pin too.
    Yeah, based on the infrequency of the "skip", this is the first thing I would check. Put it in small/small and pedal backward, watching the pulleys closely to see if the chain skips at one point in the rotation.

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