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  1. #1
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    Slipping Rear Hub? Cassette body? or Shifting?

    I bought a rear Easton EA70 XCT 29 to replace a blown up rear Sun Ringle Black Flag Pro.

    I run a 1x10 11-36t cassette with a 40t Wolf Tooth cog.

    When I am in the 11t cog and increase my pedaling force to address an incline to increase my speed on the road, the cassette slips. I get a loud clunk before it catches. I can make this happen any time I want in the 11t, but only in the 11t. 13t won't reproduce it.

    I'm not a big guy. 170lbs. Nor am I particularly strong, but this is clearly reaction to the force I am applying.

    Am I at risk of blowing this cassette body also or does this sound like more of a shifting issue?

    Thanks

  2. #2
    Oh, the huge-meh-nity
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    Sounds like a worn out 11t cog and/or worn chain to me.

  3. #3
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    Brand new chain. I'll check the cog. Thanks. Thought I caught needing a new cassette in time, so that had not even occurred to me.

    Thanks

  4. #4
    Oh, the huge-meh-nity
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    Yup, usually a worn out chain and cassette will work OK for a while, but then a new chain will climb up the teeth on worn cogs.

    Depending on how many miles you have on it, rings might be worth checking too...

  5. #5
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    It's most likely the cog or chain, or both. Could be RD adjustment as well: if the upper jockey wheel is too far from the cassette, chain wrap will be insufficient and it could slip.

    If it was the hub, the problem would be worst at larger cogs and reduced when using smaller ones.

  6. #6
    mtbpete
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    Other possible reasons that I've seen:

    1. Some chains connectors, such as the Wipperman has a curved plate that must be installed in one direction only. If it is not installed correctly it will not sit deep enough on the small gears of the cassette and then skip under power.

    2. You have an aluminum cassette body and the 11 tooth spline has cut through it. This is more likely to happen if the 11 tooth gear does not engage very deep into the spline.

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