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Chain slipping

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  • January 7, 2015 at 6:25 pm #22973
    MT63

    I have just replaced my old chain after it snapped in two while out riding. Now the new one slips when I am on the middle two cogs on the cassette when I put any pressure on the pedals. I can’t see anything wrong; the only thing I can think of is that they are possibly worn? Do I need to fit a new cassette?

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  • January 8, 2015 at 11:29 am #825441
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    le Bidon

    I replace my chain and
    I replace my chain and cassette together roughly every 4,000 miles – seems to work well for me. Though I may start changing my chain every 1,000 miles or so. Either way, definitely the cassette.

    January 7, 2015 at 10:30 pm #825439
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    jacknorell

    Bazza155 wrote:Cassette

    Bazza155 wrote:
    Cassette should always be replaced when replacing the chain.

    Not at all. Replace chain before it’s critical (after 0.5 on a measuring device but before 0.75, using the Park Tools one) and it should last 3x chains. Chainrings should last even longer.

    The OP’s cassette is shot though, and with that sort of slippage it’s probably worth looking at the chainrings too 🙁

    January 7, 2015 at 10:22 pm #825437
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    Tinternet_tim

    I’m with Aj on this one. If I
    I’m with Aj on this one. If I change my cassette everytime I change my chain I’d be skint (exaggeration, but you get the idea).
    I’ve got a Shimano DA rear cassette on my good bike and there is no way I’ll replace that every 500-1000 miles.

    I’ve had the same issue in the past with my commute bike after changing the chain. I ended up changing cable and cable outer and the gears worked perfectly. I’d be inclined to give that a go first as much cheaper option before shelling out on a cassette.

    Out of interest, how many miles has the cassette done and when did you last change cables and outers?

    Just for info, my commute bike is a little neglected in terms of replacing expensive components, but it’s well maintained. I’m still on my first cassette and the shifting isn’t too bad….it’s currently at about 9,000 miles. I’ll probably finally replace it once I get through the winter.

    January 7, 2015 at 9:29 pm #825435
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    ajmarshal1

    Bazza155 wrote:Cassette

    Bazza155 wrote:
    Cassette should always be replaced when replacing the chain.

    Disagree.

    Saying you absolutely have to change both at the same time is a bike shop falsehood designed to get you to part with your cash. Inspect the cassette by all means but if there are no signs of significant wear, keep it on.

    January 7, 2015 at 9:26 pm #825433
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    Bazza155

    Cassette should always be
    Cassette should always be replaced when replacing the chain.

    January 7, 2015 at 7:50 pm #825431
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    Flying Scot

    Yes, new cassette required.
    Yes, new cassette required.

    January 7, 2015 at 7:02 pm #825429
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    Poptart242

    Almost definitely the
    Almost definitely the cassette, as they wear along with the chain, especially in whatever are your favourite cogs.

    Had the same issue myself in the summer. Quick swap out for a new cassette and all was good again.

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