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  1. #1
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    Chain Length in Links?

    52/36 105 crankset, new Ultegra chain and 11-28 cassette. Kind of hate always having to guess-timate chain length - anyone have a similar setup? how many links to trim off?

  2. #2
    tlg
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    How long is a piece of string?

    You can't go by someone else's chain length as their chainstays are undoubtedly different length than yours. And are they using a short or medium cage derailleur?

    Never guesstimate. Use a proper sizing method.

    You can't go wrong using the small small installation method.
    https://www.artscyclery.com/learning...roadchain.html

    Or use the method instructed by Shimano
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  3. #3
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    Quote Originally Posted by jmcg333 View Post
    52/36 105 crankset, new Ultegra chain and 11-28 cassette. Kind of hate always having to guess-timate chain length - anyone have a similar setup? how many links to trim off?
    You haven't provided anywhere near enough info to do this, and it's the worst possible way to size a chain. As tlg posted if everything is in spec the small/small method is pretty easy and fool proof. Never guess at chain length.
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    Quote Originally Posted by tlg View Post
    How long is a piece of string?

    You can't go by someone else's chain length as their chainstays are undoubtedly different length than yours. And are they using a short or medium cage derailleur?

    Never guesstimate. Use a proper sizing method.

    You can't go wrong using the small small installation method.
    https://www.artscyclery.com/learning...roadchain.html

    Or use the method instructed by Shimano
    The second method worked perfectly for me, and there's no guesswork. Wrap the chain around the biggest cog and biggest chain ring, bypassing the derailleur. Add two links (one inch).

    See the Park Tool link below, on matching up inner and outer plates on the chain ends:

    More details here, with photos: Park Tool guide: Chain Length Sizing
    Last edited by rm -rf; 05-02-2018 at 12:36 PM.

  5. #5
    tlg
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    Quote Originally Posted by rm -rf View Post
    The second method worked perfectly for me, and there's no guesswork. Wrap the chain around the biggest cog and biggest chain ring, bypassing the derailleur. Add two links (one inch).
    There's one caveat to this method. You can never go to a larger cassette or chaining.
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  6. #6
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    Quote Originally Posted by jmcg333 View Post
    Kind of hate always having to guess-timate chain length.
    was there already a chain on the bike? use that. it may not be right, but it's often an effective starting point.
    Yossarian: don't worry. nothing's going to happen to you that won't happen to the rest of us.

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    Quote Originally Posted by rm -rf View Post
    The second method worked perfectly for me, and there's no guesswork. Wrap the chain around the biggest cog and biggest chain ring, bypassing the derailleur. Add two links (one inch).

    See the Park Tool link below, on matching up inner and outer plates on the chain ends:

    More details here, with photos: Park Tool guide: Chain Length Sizing
    Thanks the info-graphic helped I was having trouble until I just measured with the quicklinks on - for some reason I can't wrap my mind around this chain stuff.

  8. #8
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    Quote Originally Posted by cxwrench View Post
    You haven't provided anywhere near enough info to do this, and it's the worst possible way to size a chain. As tlg posted if everything is in spec the small/small method is pretty easy and fool proof. Never guess at chain length.
    And with limited fingers and toes counting links isn't so good either. Not for me anyway.

    But yeah, like someone else said use the previous one to measure against of course assuming it's okay and you're using the same cassette and rings.

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    Note that Shimano actually has an older Campy-style sizing method for cassettes 27t and lower. Kind of the way we used to size chains for straight blocks back in the day.

    See, http://si.shimano.com/pdfs/dm/DM-CN0001-05-ENG.pdf

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