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  1. #1
    RoadBikeReview Member
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    26T front derailleur capacity

    I'm building triple touring bike and have Shimano 105 FC-5703 50/39/30 crankset.
    For it to pair I have FD-4603 front derailleur.

    I also have 53T-B spare chainring that I plan to use instead of 50T one. For this 53/39/30 combo I have Ultegra FD-6703...thid fd will not shift properly 50/39 combo so I'm not using it with 50T big ring.

    Since I plan to do a lot of loaded climbing on my touring, what I want to do now is install 24T small ring. I plan to use it in 50/39/24 combo meaning I need derailleur with 26T capacity.
    Officially FD-4603 has capacity of 20T, but has anyone tried it and will it work in 26T big-small difference mode?

    Ultegra FD-6703 has officially 22T capacity, but for it with small 24T I would have to use 53/39/24 combination giving 29 differance. Did anyone try FD-6503 successfully in this setup?

    Sent from my SM-G925F using Tapatalk
    Ante Smokrovic

    2009 De Rosa Neo Pro - Fedaia, Giau, Pordoi, Sella, Gardena, Campalongo, Falzarego, Valparola, San Pellegrino, Valles, Staulanza, Vršič, Mangart, Furcia...

    2003 De Rosa Team - Stelvio, Gavia, Mortirolo, Bonette, Agnel, Izoard, Fedaia, Giau, Pordoi, San Pellegrino, Staulanza, Manghen, Vršič, Učka, Mangart, Biokovo, Eisentalhöhe, Schonfeld, Schiestelscharte, Flattnitz...

  2. #2
    RoadBikeReview Member
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    I doubt this would work very well if it works at all.

    If you really want a triple with low gearing, you will need to find an older mountain or touring crankset. Check eBay for new/old stock.
    "With bicycles in particular, you need to separate between what's merely true and what's important."-- DCGriz, RBR.

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  3. #3
    Out riding.
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    You're gonna struggle with this. You're going to need a combination of road/mountain crankset/groupset to find a combination that is going to make this work.

  4. #4
    RoadBikeReview Member
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    In meantime i installed what I wanted.
    Shimano 105 FC-5705 50/39/26 crankset. Instead of stock small 30T I put Stronglight 26T.
    Derailleur is Tiagra FC-4603.
    Thing works perfect, without single problem, shifts are without any hesitation.
    Cage is low enough for 26T, however I think it's the lowest possible, with 24T chain would rub on the cage.
    With Ultegra triple front derailleur which is designed for 52T big I'm sure I would get 53/39/26 to work.

    Sent from my SM-G925F using Tapatalk
    Ante Smokrovic

    2009 De Rosa Neo Pro - Fedaia, Giau, Pordoi, Sella, Gardena, Campalongo, Falzarego, Valparola, San Pellegrino, Valles, Staulanza, Vršič, Mangart, Furcia...

    2003 De Rosa Team - Stelvio, Gavia, Mortirolo, Bonette, Agnel, Izoard, Fedaia, Giau, Pordoi, San Pellegrino, Staulanza, Manghen, Vršič, Učka, Mangart, Biokovo, Eisentalhöhe, Schonfeld, Schiestelscharte, Flattnitz...

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