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  1. #1
    Bike Shop Girl
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    Karate Monkey Dropout Gear Difference

    I'm hoping some techie will know this.

    Running single speed/fixed, what is the biggest difference of cogs you can use on the same chain length?

    Example : Same chainring, same chain, if I was to install the biggest cog with the wheel all the way forward. And then the smallest cog with the wheel pulled as far back as possible, what is the difference?

    trying to build up a fixed/free and want to have the widest range I can.

    Thanks!
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  2. #2
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    Reputation: slimhazy's Avatar
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    From Sheldon Brown:
    Adding or subtracting a link in the chain will move the axle 1/2". Changing either sprocket size by one tooth is the equivalent of moving the axle 1/8" (4 mm).
    My KM isn't in front of me right now, but you should be able to get ~4-5 teeth worth of difference. I changed my 1x1=1 from 15T to 22T and I think I only added 1 link...

  3. #3
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    I use an 18, 19 and 20 without changing the chain(34 tooth ring).

  4. #4
    Ron
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    I use 32x20 for trails which has the axle almost all the way forward and then change to 32x16 for gravel\paved roads with the same chain no problem.

  5. #5
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    Quote Originally Posted by Arsbars View Post
    I'm hoping some techie will know this.

    Running single speed/fixed, what is the biggest difference of cogs you can use on the same chain length?

    Example : Same chainring, same chain, if I was to install the biggest cog with the wheel all the way forward. And then the smallest cog with the wheel pulled as far back as possible, what is the difference?

    trying to build up a fixed/free and want to have the widest range I can.

    Thanks!
    Use this to calculate the resulting effective chainstay length with different gearing:
    http://eehouse.org/fixin/fixmeup.php

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