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Shimano 105 5800 fd front derailleur sizing

  • This topic has 6 replies, 3 voices, and was last updated 7 years ago by ChrisB200SX.
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  • June 15, 2019 at 5:07 pm #29756
    rob39

    Not having a great day 1st freehub now this. So the hex screw holding the cable on the front derailleur has sheared off, leaving a piece in. So needing a new derailleur but I see when ordering one it comes in a couple of sizes 34.9mm & 28. 6 / 31.8mm. What does this relate to and how to know which to order

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  • June 17, 2019 at 4:51 pm #943963
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    ChrisB200SX

    Order the 5801 or R7000 or

    Order the 5801 or R7000 or R8000. They are supposed to be a lot better revised mechanism.

    June 15, 2019 at 11:24 pm #943961
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    The _Kaner

    If it’s braze on then there

    If it’s braze on then there is no diameter size, you must be looking at the wrong type of FD.

    Look for a braze on FD.

    June 15, 2019 at 6:13 pm #943959
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    rob39

    It’s braze on should have
    It’s braze on should have said that

    June 15, 2019 at 6:03 pm #943957
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    The _Kaner

    Braze on

    Braze on

    June 15, 2019 at 6:02 pm #943955
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    The _Kaner

    Band on

    Band on

    June 15, 2019 at 5:58 pm #943953
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    The _Kaner

    That is the band-on diameter

    That is the band-on diameter size. You will need to know the diameter of your seat tube, so you can look up the bike spec and go from there, or if you have a set of vernier calipers you can measure the seat tube and select the correct  one. Failing that you can wrap a tape measure around the tube and use diameter = circumference / pi.

    Just make sure it’s a band on type you need and your frame isn’t braze on, then you’d need to select a braze on version.

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