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  1. #1
    Bike Breaker
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    1/4 chain too loose????

    I am running standard shimano front chainring and SS rear cog with SRAM 1/4 chain. The chain feels real loose on the cog and chainring. It keeps jumping off on the front. My chainline is real straight. Could the loose chain cause the derailling? Would going to a 3/32 chain solve the problem?

  2. #2
    Medium?
    Reputation: Fast Eddy's Avatar
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    You mean 1/8" chain?

    The width of the chain won't cause it to derail. More likely it isn't properly tensioned. It should be pretty tight at the tightest place in the rotation, without binding. In my experience, it doens't much matter what rings you use. Is this with horizontal dropouts, or what kind of tensioner do you use?

  3. #3
    Bike Breaker
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    Right . .sporry 1/8 inch chain. Vertical dropouts with Singlelator. I don't think that I can take another link out. may have to increase tension. But the you can slide the chain all around on the teeth, and my geared bike doesn't have any play at all.

  4. #4
    mtbr member
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    Tension

    Quote Originally Posted by bigmike13
    Right . .sporry 1/8 inch chain. Vertical dropouts with Singlelator. I don't think that I can take another link out. may have to increase tension. But the you can slide the chain all around on the teeth, and my geared bike doesn't have any play at all.
    Fast Eddy is probably right. The chain width won't make much difference unless it is to narrow. Your chain is likely too lose. Adjust the singleator to tension the chain more. Or better yet, figure out how to run tensionerless.
    "I've never been better .... nor cared less!"

  5. #5
    Bike Breaker
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    LBS says chainline is off too much and not enough tension on the chain.

  6. #6
    Retro Grouch
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    New question here. New or old Singleator?

    Quote Originally Posted by bigmike13
    LBS says chainline is off too much and not enough tension on the chain.

    If it looks like the one below it will handle an 1/8 inch chain; if not you can only use 3/32" (7/8/9 speed); also Singleators are pretty bad tensioners compared to a deraileurs.

    1G1G, Brad
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    Last edited by aka brad; 10-20-2004 at 08:15 PM.

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