Swapping chainring/cog setups and chain length- Mtbr.com
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  1. #1
    Combat Wombat
    Reputation: BrianU's Avatar
    Join Date
    Feb 2004

    Swapping chainring/cog setups and chain length

    I have a 2008 16" Jabberwocky that I have run with a 34/20 for most of the time I have owned it and used a half-link to get the axle pretty close to the middle of the horizontal dropouts. Take the half-link out and depending on if you add or shorten the chain, it puts the axle at extreme ends of the dropouts. Recently a different job has put me in a location where hitting a LBS is now convenient. I like the idea of just grabbing a chain when I need it, along with helping out a good LBS. This has also had me considering ditching the half-link. Just one less thing I don't want to mess with. I used this website to calculate chain lengths.


    From what I can tell, switching to a 32/19 setup would put me real close to what I currently run, only add .13" to the length, and ditch the half-link. Is anyone familiar with this website and if so, does it look like I am figuring this correctly? I would also appreciate any first hand experience with running a 32t chain ring on a 16" Jabberwocky frame and what has worked for you.

  2. #2
    mtbr member
    Reputation: AlexCuse's Avatar
    Join Date
    Nov 2011
    The calculator on that website works pretty well, long as you know the numbers to put in it.

    Anecdotally speaking, I went from 34-20 to 32-19 on my bike last year sometime. With 34-20 the axle was in the middle of the dropouts and changing it put the wheel way toward the back end. Removing a link got it right where I like it. So it seems like you are probably on the right track.
    Yeah I only carry cans cause I'm a weight weenie.

  3. #3
    psycho cyclo addict
    Reputation: edubfromktown's Avatar
    Join Date
    Sep 2010

    Swapping chainring/cog setups and chain length

    That is a great calculator.

    I run multiple single speeds and depending on what isn't in use requires considering other chainring/cog combinations.

    For a single rig/cog combo calculator, this is my goto one...

    【ツ】 eDub 【ツ】

  4. #4
    Combat Wombat
    Reputation: BrianU's Avatar
    Join Date
    Feb 2004
    Thanks for the information!

  5. #5
    Always in the wrong gear
    Reputation: Impetus's Avatar
    Join Date
    Aug 2014
    32/22 on a 16 Jabber puts the sliders about 3mm from full forward slam.
    32/19 is about 1/3 of the way back from forward, IIRC.
    I got a WolfTooth stainless 19T cog on the Scratch-n-dent, mounted it just to see it fit and took it back off for an upcoming steep/tech ride. I'm away on business until Friday, but can check if needed then.

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