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  1. #1
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    Shimano FD-9000 compatible with ST-7900 brifters?

    Does anyone know if a Shimano Dura-Ace 9000 Front Derailleur (FD-9000) is compatible with DA 7900 Shifters (ST-7900)?

    I've heard the 9000 Front Derailleur is smoother and I'm going to upgrade my crankset to FC-9000 with a Stages power meter and thought the new FD might be a nice addition.

    Thanks, in advance!

  2. #2
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    Bump, also curious to know the answer. Although I intend to upgrade our road bikes to 9000, the wife has trouble shifting the 7900 front derailleur on her cross/gravel bike and they may not get upgraded for quite a while.
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  3. #3
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    Not compatible, they have different cable pulls.

  4. #4
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    I'm not disputing your knowledge Cinelli82220, but this is surprising to me.

    I would definitely believe this to be true for the Rear Derailleur since it's 11-speed. But I don't understand why the cable pull would be different between 7900-9000 shifter for the FD. Chain ring separation hasn't changed and chain ring width hasn't changed. I read that they added the extra trim stop back on 9000 but that shouldn't affect cable-pull. Do you have a "source" or any more information on this? I'm almost tempted to purchase an FD-9000 just to test my theory out.

  5. #5
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    Quote Originally Posted by dsevern View Post
    Chain ring separation hasn't changed and chain ring width hasn't changed.
    Based on my experience using a Speen 'Umlenker' on a DA 7900 front derailleur, I am inclined to think Cinelli is correct. Although my experiment significantly improved ease of shifting on the wifes cross bike by extending the lever arm of the derailleur, it also altered how much throw for the amount of cable pull. As a result, when riding in the big chainring, my wife gets chain rub on the outer cage of the derailleur when she shifts into the 3 smallest rear cogs. I can tune the derailleur not to rub on the inner throw or the outer throw but not both. As a result of this process, I already have a couple different front derailleurs so am also tempted to purchase a FD-9000 just to see if it would work.
    Michael - There may not be an 'I' in team but there is a 'U' in suck!
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