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  1. #1
    Senior Member d2create's Avatar
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    Chain just a tad too tight

    Single speed setup on a road bike with vertical drops.
    Chain is just a tad too tight.
    Current chain ring upfront is a 48.
    I have noooo idea how much difference taking away just one tooth will make if I change it out.
    Should I try a 47 or 46 or 45 or.... ?
    I know you can't tell for sure without seeing it but maybe you can give me some kind of idea?

    And which would make a bigger difference? One tooth less on the front chain ring or one tooth less on the rear sprocket? Current rear sprocket size is 20t.

    The rear is an i-motion 9 speed internal geared hub so I can play around with sizing more than a standard single speed.

    Thanks!
    2008 Rivendell A. Homer Hilsen
    Pics and Specs Here!

    2010 Specialized Rockhopper 29er

  2. #2
    Geek Extraordinaire sivat's Avatar
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    The difference in 1 tooth will be about 1/8" in the chain (1/2" total but split between the top and bottom sections of the chain). The difference will be the same if you change the cog or the chainring. The best solution is probably a half link.
    I'd rather have a bottle in front of me than a frontal lobotomy.

    Sintesi Conversion Serotta Track

  3. #3
    Senior Member d2create's Avatar
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    Thanks!
    I actually have a half link and if I install that the chain is too long.
    I was hoping to get somewhere in between.
    2008 Rivendell A. Homer Hilsen
    Pics and Specs Here!

    2010 Specialized Rockhopper 29er

  4. #4
    Geek Extraordinaire sivat's Avatar
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    Consider this, each link in a chain will mesh with a single tooth on the cog or chainring. Adding a half link is the same as subtracting a single tooth from either the cog or chainring. It sounds like you will either need to run a chain tensioner like the surly singleator or try a different chainring/cog combo that will give you a similar ratio. Perhaps 46/19. But there is not guarantee that it will be any better. You might want to give this a shot: http://eehouse.org/fixin/fixmeup.php
    I'd rather have a bottle in front of me than a frontal lobotomy.

    Sintesi Conversion Serotta Track

  5. #5
    Senior Member d2create's Avatar
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    Ok, cool.
    So after I input my info, any gear combo in the highlighted column will give me the correct chain tension?
    If so, it looks like it's telling me that I just have to get the bring the front ring from 48t down to 46t and take 3 links off the chain.
    2008 Rivendell A. Homer Hilsen
    Pics and Specs Here!

    2010 Specialized Rockhopper 29er

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