Chain tension-how much?- Mtbr.com
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  1. #1
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    Chain tension-how much?

    I'm running a Rohloff hub on a standard vertical dropout frame. I'm using a chain tensioner and have it pulled about as tight as the picture in the Rohloff manual. On rocky, technical trails my chain keeps coming off. ANytime I hit large bumps at speed, I'm losing my chain. How tight should I be running my chain?

  2. #2
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    Is your tensioner pushing down on the chain or pushing up? If you can install it pushing up I think you'll have better luck.

  3. #3
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    Tight enough...

    So that when plucked, it should ring out in a clear A#.

    Seriously, I like it when there is approximately 1/2" of vertical play in the chain. Where is it coming off on the rough trail, the cog or the chainring? Could your chainline be to blame?

  4. #4
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    Thanks for the reply's. The chain is coming off of the chainring. Chain line is dead on straight. I think I'm going to remove a few links and see if that helps. I'm running a 9 speed chain, dont know if thats causing the problem or not. Probably not.

  5. #5
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    Are you running a SS specific chainring, that is, one without ramps or pins, and with tall teeth? Sometimes the taller teeth are all you need.

  6. #6
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    Nope. Running a standard shimano chainring. I'll check into what your talking about. Thanks

  7. #7
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    Quote Originally Posted by chipw
    Nope. Running a standard shimano chainring. I'll check into what your talking about. Thanks
    That's the problem. I had the same issue with my first SS build. I've used a tensioner and ramped cogs from a busted up cassette, and never dropped the chain from a cog, but no matter how tight the chain, it would always drop from a ramped ring. There are lots of non-ramped rings available.

  8. #8
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    Quote Originally Posted by chipw
    Nope. Running a standard shimano chainring. I'll check into what your talking about. Thanks
    If you can, use a 8-speed unramped chainring, and an 8-speed or lower chain. High end chains are also designed to derail easily (to aid shifting). I've been using a lower end 6-speed KMC chain on my Rohloff.

    If all else fails, Rohloff has a front chain guide that will solve this problem.

  9. #9
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    Quote Originally Posted by itsdoable
    If you can, use a 8-speed unramped chainring, and an 8-speed or lower chain.
    There are plenty of single-speed and BMX specific chains that are 3/32" wide (8-speed stuff). Also, Surly, Salsa, and Blackspire all make SS specific chainrings. Surly's are steel though, so they will probably last longer.

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