Shortest chain length?-
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  1. #1
    mtbr member
    Join Date
    Sep 2008

    Shortest chain length?

    Hi folks, I need some help here - I did some searching, but didn't find much on this topic.... although I'm sure I'm not the first with this situation.

    I just built up a Kona Honzo and want to get the shortest effective chainstay length I can. i.e. I want the rear axle slammed as far forward in the sliders as possible.

    I'm currently running 33x21 (yes, I'm weak), the rear axle is in about the middle of the sliders. The ratio of a 30x19 is close to the 33x21, with smaller chainring and cog I should be able to shorten the chain, although I'm not sure how much.

    Will this get me what I'm looking for? Any downsides to changing the ring/cog - reduced chain/chainring/cog life?

  2. #2
    one chain loop
    Reputation: fishcreek's Avatar
    Join Date
    Apr 2007
    edited: lose one link and shorten the CS length by third of an inch.
    everything sucks but my vacuum cleaner.

  3. #3
    mtbr member
    Join Date
    May 2005
    That is a perfectly reasonable gear ratio for riding in the mountains. Anyway, I run 32 x 21 on my Honzo and the sliders are very close to all the way forward. Sounds like dropping a tooth up front would hurt your ego, but I thought I'd mention it anyway.

  4. #4
    mtbr member
    Join Date
    Jan 2011
    Use a half link to shorten the chain a small amount

  5. #5
    mtbr member
    Join Date
    Sep 2008
    Thanks for the replies! No ego here, but I'd like to keep something close to the ratio I'm currently running, as I already spin out readily enough. These three ratio's are all very close:

    33x21=11.93 feet per crank revolution


    32x21 and 33x20 aren't far off either. I have a 20t cog, so I could give 33x20 a try without spending any money - just not sure how much shorter the chain could be by dropping a single tooth.

    Dropping teeth on both chainring and cog should allow a shorter chain, I'm just not sure how much shorter. Going 32x20 saves me the cost of a cog. Going 30x19 would require purchasing both. Additionally, my understanding is that smaller rings/cogs increases wear on the ring/cog and chain - not sure how much though.

  6. #6
    nothing to see here
    Reputation: Stevob's Avatar
    Join Date
    Feb 2009
    Your effective chainstay length changes by approximately 3mm for every tooth on the cog or chainring.
    I see hills.

    I want to climb them.

  7. #7
    The need for singlespeed
    Reputation: zaskaranddriver's Avatar
    Join Date
    Oct 2009
    Quote Originally Posted by fishcreek View Post
    edited: lose one link and shorten the CS length by third of an inch.
    I think that's half an inch there, fish.

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