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  1. #1
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    what are the different variants of Ultegra R8000 front mechanical derailleur?

    I see that there are 3 variants of this derailleur:
    FD-R8000-B (L)
    FD-R8000-B (S/M)
    FD-R8000-F

    I'm looking to get one for my steel frame (which currently has the old DA 7800 groupset), but I'm not sure what variant to get. A quick search on google hasn't turned up any explanation for me. Please advise.

  2. #2
    'brifter' is a lame word.
    Reputation: cxwrench's Avatar
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    Does your steel frame have a braze-on mount?

    Far as I can tell from looking at si.shimano.com the 3 are braze-on, clamp, and clamp s...which I guess is 'small' or 'steel'? The 's' is the one w/ the shim so maybe the 's' is for shim.
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  3. #3
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    Quote Originally Posted by cxwrench View Post
    Does your steel frame have a braze-on mount?

    Far as I can tell from looking at si.shimano.com the 3 are braze-on, clamp, and clamp s...which I guess is 'small' or 'steel'? The 's' is the one w/ the shim so maybe the 's' is for shim.
    Bike has no braze-on mount. I'm currently using a band-on derailleur with clamp diameter 34.9mm.

    Looking that Bikedirect's description,
    Shimano Ultegra FD-R8000-B Front Derailleur

    It looks like:
    • FD-R8000-B (L) is band-on with 34.9mm clamp. "L" is for large?


    • FD-R8000-B (S/M) is band-on 31.8mm (with a 28.6mm adapter). I'm guessing "S/M" is small/medium?


    • FD-R8000-F is braze-on



    Does this sound right?

  4. #4
    'brifter' is a lame word.
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    Quote Originally Posted by aclinjury View Post
    Bike has no braze-on mount. I'm currently using a band-on derailleur with clamp diameter 34.9mm.

    Looking that Bikedirect's description,
    Shimano Ultegra FD-R8000-B Front Derailleur

    It looks like:
    • FD-R8000-B (L) is band-on with 34.9mm clamp. "L" is for large?


    • FD-R8000-B (S/M) is band-on 31.8mm (with a 28.6mm adapter). I'm guessing "S/M" is small/medium?


    • FD-R8000-F is braze-on



    Does this sound right?
    Sounds good to me
    I work for some bike racers
    I've got some bikes, some guns,
    and a bunch of skateboards

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