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  1. #1
    mtbr member
    Join Date
    Apr 2013

    Single speed chain help

    Hey guys,

    Just bought some parts to convert my 3x9 mtb to a ss. It has vertical dropouts so I got a spring type tensioner. This type swings down like a deraileur. How do I measure the chain for this setup?

    Thanks. Any help would be appreciated

  2. #2
    Reputation: ElwoodT's Avatar
    Join Date
    Mar 2011
    Wrap your chain around the cog and and chainring. Cut the chain at the smallest length that still fits. This length will most likely be slack and your tensioner does the rest. If it's not slack and not super tight then you just lucked out and found a magic gear.

  3. #3
    Plays with tools
    Reputation: customfab's Avatar
    Join Date
    Jun 2008
    Wrap it around the lowest gear you plan on using and add two links. The tensioner will take up those two links and take up the additional slack when you swap to taller gearing.

  4. #4
    Reputation: ElwoodT's Avatar
    Join Date
    Mar 2011
    ^^this is good advice. My ss bikes have had sliding or horizontal dropouts and so didn't need extra chain length as I was experimenting w/ rear cog sizes. (I settled on a 22 and haven't changed sizes in a few years).

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