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  1. #1
    Senior Member tlippy's Avatar
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    What is the difference between a double and a triple FD?

    Can anyone tell me the exact difference between a 105 double and triple FD.
    Specifically the difference between a FD-5501 and FD-5504?
    Schwinn Mesa GS MTB,ThudBuster seat post, weighs in @ 34#
    Fuji CX, Rings 30/42/52, Cogs 12-26, weighs in @ 20#

    "Old guys need lower gears"

  2. #2
    Senior Member demoncyclist's Avatar
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    On a triple der, the cage is slightly wider to accomodate the larger difference between the largest and smallest rings.
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    Satanic Mechanic
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    2011 Lynskey Sportive (Shimano Ultegra 10s)
    1988 Cannondale SM400 (Suntour XC-M 7s)

  3. #3
    Senior Member Retro Grouch's Avatar
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    Couple of differences that I can see.

    Quote Originally Posted by tlippy
    Can anyone tell me the exact difference between a 105 double and triple FD.
    Specifically the difference between a FD-5501 and FD-5504?
    I went down to my shop where I have a pair of Ultegra bikes. One has a double and one has a triple front derailleur. At a glance:
    1. The triple cage has a much wider inner blade. I assume that's to lift the chain from the granny to the middle chainring better.
    2. The triple cage seems to drop lower in back. I assume that's to prevent rubbing if you are in the granny and one of the smaller rear cogs.

  4. #4
    Senior Member tlippy's Avatar
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    Thanks

    Thanks guys------that's the info I wanted.
    Schwinn Mesa GS MTB,ThudBuster seat post, weighs in @ 34#
    Fuji CX, Rings 30/42/52, Cogs 12-26, weighs in @ 20#

    "Old guys need lower gears"

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