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  1. #1
    Hi. I'm in Delaware. Robbykills's Avatar
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    problem with single speed drivetrain

    So I have an MTB converted to single speed with a pyramid tensioner, surly cog and I've tried two different cranks. The problem has been the same each time.

    As I put pressure on the pedals to accelerate the drive train skips and makes a "KLUNK KLUNK!" I can't figure out what it could be. I figured maybe the chainline was off so I got a narrower bottom bracket. The chain line seems to be alright and the chain isn't too slack or too tight. What do you guys think is doing this?

    Oh, I'm also going to post this to bike mechanics too.

    Thanks
    = ]

  2. #2
    Hi. I'm in Delaware. Robbykills's Avatar
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    1985 Schwinn Voyageur (Touring, Commuter), LMNO custom track (www.lmnocycles.com), 1999 Gary Fisher Mt. Tam SS, 2003 Motobecane Mirage, IRO Group Buy Rob Roy cruiser-fied, Dirt Research Kobuck (pedicab equipped)
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    the chainring and chain are brand new, the cog was bought used but appears to be fine, only cosmetically it's flawed with some chain grease, it doesn't look excessively worn though. I'll try it out with a different cog and see if it makes a difference. thanks!

  3. #3
    Hi. I'm in Delaware. Robbykills's Avatar
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    Nov 2004
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    1985 Schwinn Voyageur (Touring, Commuter), LMNO custom track (www.lmnocycles.com), 1999 Gary Fisher Mt. Tam SS, 2003 Motobecane Mirage, IRO Group Buy Rob Roy cruiser-fied, Dirt Research Kobuck (pedicab equipped)
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    (oops I think I accidently deleted the response post?)

  4. #4
    Senior Member
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    07 Fisher Paragon, 00' Lemond Buenos Aries, Specialized Langster, Schwinn World Sport SS townie, 99 SS-Works single speed conversion, early 90s Raleigh roadie rain bike, 07 Fisher Rig, Trek 520, and a home-modified chopper
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    The *clunk clunk* is the chain slipping on the cog or chainring (probably cog). It could be a wear issue, or you might just be running too long a chain. If the chain is too long it won't wrap the cog enough and it'll slip. See if you can take a link out to get the chain as short as possible.

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