Shimano Ultegra RD-6870-SS rear derailleur compatible with 11-28 cassette
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  1. #1
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    Shimano Ultegra RD-6870-SS rear derailleur compatible with 11-28 cassette

    Can you use an 11-28 cassette with an 11-speed Shimano Ultegra RD-6870-SS rear derailleur (Di2)?

    The Shimano website at product seems to suggest that when your largest cog is a 28, the smallest that a cog can be is 12 teeth. Or perhaps I'm reading it wrong.

    The same question would apply, I suppose, to an 11-speed Shimano Ultegra RD-6800-SS rear derailleur (mechanical).

    FWIW, the setup I'm proposing to use is a 50-34 with an 11-28 cassette, which would not exceed the total capacity that Shimano specifies for this derailleur.

    Thanks in advance!

  2. #2
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    It's fine. Should be no problem whatsoever.

  3. #3
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    you're reading it wrong.

    it was designed to work with that cassette, you're good to go.
    use a torque wrench

  4. #4
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    Quote Originally Posted by MMsRepBike View Post
    you're reading it wrong.
    Thanks for the reply. How do you read this then?
    Maximum Sprocket low: 28T, top:12T
    Minimum Sprocket low: 23T, top:11T

    (From: product)

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