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Thread: Chain Suck

  1. #1
    Senior Member MrCjolsen's Avatar
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    Chain Suck

    What causes it.
    How do I keep it from happening again?

    Almost new bike, Sora triple. Going up a steep hill and shifting down to the small chainring. No major damage

  2. #2
    Senior Member MudPie's Avatar
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    Quote Originally Posted by MrCjolsen
    What causes it.
    How do I keep it from happening again?

    Almost new bike, Sora triple. Going up a steep hill and shifting down to the small chainring. No major damage
    A few factors cause chain suck - bent tooth on chainring, drive train misalignment, bad/stiff link(s) on chain, frame design.... What brand/model frame and chain do you have? Some say that shifting under heavy load (slow cadence) contributes to chainsuck too - so make sure you get the cranks spinning before you shift down.

    In the past, on a mountain bike, I noticed chainsuck was more likely to occur with a muddy/gritty chain. However, chainsuck went away when I started cleaning and lubing the chain every 3rd ride or so. I use a "dry" lube, too. So I have some experiece with a dirty chain syndrome.

    I read (in www.mtbr.com) that Gary Fisher (especially their 2004 Cake models) were very prone to chainsuck. I contacted Fisher and they said it was due to excessive play in the rear suspension pivot, implying alignment. (Fisher did repair all their remaining stock and I bought one.)

  3. #3
    Guy with bike
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    I posted a question about this here the other day and someone pointed me to this site:

    http://www.fagan.co.za/Bikes/Csuck/

    It's got way more information about chain suck than you ever wanted to know.

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