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  1. #1
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    Basic rear derailleur question

    Hey all, just wondering why rear derailleur cages come in short, medium and long lengths. I am
    building an older jeckyll and am trying to figure out which length cage i should run on it. It seems like
    I see a lot of longer cages on bikes, but am curious why you wouldn't use a shorter one so as to be less
    likely to snag it on something.

    Any help or advice is much appreciated!
    Jack

  2. #2
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    In general - 1 front chain ring - short cage
    2 front chain rings - medium cage
    3 front chain rings - long cage

  3. #3
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    Ok thanks, that might explain why my other cannondale with the typical 3 chainring setup and a medium cage doesn't shift that smoothly with the front derailleur, seems to take a fair amount of effort to get it to shift.

  4. #4
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    Quote Originally Posted by jackk View Post
    Ok thanks, that might explain why my other cannondale with the typical 3 chainring setup and a medium cage doesn't shift that smoothly with the front derailleur, seems to take a fair amount of effort to get it to shift.
    Almost certainly due to the adjustment of the shifting. I would change your derailleur cables and housing, re-adjust your shifting, and report back.

    The derailleur is dumb, it just does what the shifter tells it to do. So long as you have enough length (short, med, long) that your chain can reach all the gears, there isn't anything a long cage does that a short cage doesn't.
    Don't you hate it when a sentence doesn't end the way you think it octopus?

  5. #5
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    Basic rear derailleur question

    Quote Originally Posted by jackk View Post
    Hey all, just wondering why rear derailleur cages come in short, medium and long lengths. I am
    building an older jeckyll and am trying to figure out which length cage i should run on it. It seems like
    I see a lot of longer cages on bikes, but am curious why you wouldn't use a shorter one so as to be less
    likely to snag it on something.

    Any help or advice is much appreciated!
    Jack
    When to use a Long Cage vs Short Cage Derailleur?
    mtbtires.com
    The trouble with common sense is it is no longer common

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