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  1. #1
    mtbr member
    Join Date
    Apr 2013

    Do I need a new cassette?

    I had my lbs check main chain for stretch today, and it was stretched. The 2 step gauge they had just showed enough stretch to warrant buying a new chain, but there was not enough to warrant a new cassette.
    I bought a sram 951 and put it on. I checked its 9 speed and correct for my bike. But it runs with a clicking sound, and when I turn the pedals while my bike is hanging free on the hanger, it feels very rough / catchy. Is this a sign I need to replace my cassette as well? See the attached pic of my cassette.

    i have a 2007 stumpjumer comp
    Attached Thumbnails Attached Thumbnails Do I need a new cassette?-image.jpg  

  2. #2
    mtbr member
    Join Date
    Apr 2013
    Ps the cassette is a bit grubby in the photo because I just hosed down after a ride. Otherwise the cassette looks fairly good.

  3. #3
    mtbr member
    Join Date
    Apr 2005
    It doesn't look particularly worn, but it's hard to tell in that photo. There doesn't appear to be any of the shark-fin teeth that you get in a badly worn cassette. The ultimate test is to ride it, and see if your chain skips or jumps on any of the cogs when you're pedaling hard.

  4. #4
    Big Gulps, Alright!
    Reputation: Berkley's Avatar
    Join Date
    May 2007
    Original cassette? If so, it might be time for a replacement.

    The valleys between the teeth look pretty deep. If the chain is hanging up, it's a good indicator.
    Axle Standards Explained

    Founder at North Atlantic Dirt, riding & writing about trails in the northeast.

  5. #5
    mtbr member
    Reputation: doismellbacon's Avatar
    Join Date
    Sep 2007
    Could be a new cassette is required, but sounds more like you're describing a misadjusted derailleur. Like authalic said, the test is in the jumping/or not under hard pedaling.

  6. #6
    Elitest thrill junkie
    Reputation: Jayem's Avatar
    Join Date
    Jul 2005
    There's always some "teething" that happens when you replace a chain, assuming the cassette is still good-enough. It might take a few miles for it to calm down.
    "It's only when you stand over it, you know, when you physically stand over the bike, that then you say 'hey, I don't have much stand over height', you know"-T. Ellsworth

    You're turning black metallic.

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