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  1. #1
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    Dura-Ace front derailleur?

    Hello everyone,

    I've been thinking about throwing a Dura-Ace front derailleur on my current project. My question is, will it work with a typical 3x9 setup? Just wanted to make sure I wasn't stuck to doing a 2x9 if I used that derailleur in the front.

    Thanks for any input, and for your time!

    2006 Kona Leroi


    Quote Originally Posted by azonicrider188a
    well just get your asses some juicy 7s and huck down a mountain. thoose v brakes will snap like my butt

  2. #2
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    I am not too sure how good of an idea that would be. Technically there is a Dura-Ace front derailleur designed for a triple crankset. But, the new Dura-Ace derailleur is designed to be used with a 10 speed system (narrower chain I believe) and a crankset with a 52 tooth large chainring. If you were to install the derailleur, the cage would not follow the contour of the crank correctly. This will result in the chain not being positioned over the contours in the cage when trying to shift resulting in poor shifting or possible jamming. Also, you may have the chain rubbing on the derailleur cage in certain gear combinations due to where the derailleur is realtive to the chainrings.

    This next part I am not 100% sure on but I believe the indexing of MTB front derailleurs is different than that of road front derailleurs too. When Shimano designed components for the flat bar road bikes they needed to make new rapid fire shifters just for that purpose.
    There is no added value to my participation - in fact, just more confusion.

  3. #3
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    Thanks!!!

    Quote Originally Posted by GearHead
    I am not too sure how good of an idea that would be. Technically there is a Dura-Ace front derailleur designed for a triple crankset. But, the new Dura-Ace derailleur is designed to be used with a 10 speed system (narrower chain I believe) and a crankset with a 52 tooth large chainring. If you were to install the derailleur, the cage would not follow the contour of the crank correctly. This will result in the chain not being positioned over the contours in the cage when trying to shift resulting in poor shifting or possible jamming. Also, you may have the chain rubbing on the derailleur cage in certain gear combinations due to where the derailleur is realtive to the chainrings.

    This next part I am not 100% sure on but I believe the indexing of MTB front derailleurs is different than that of road front derailleurs too. When Shimano designed components for the flat bar road bikes they needed to make new rapid fire shifters just for that purpose.
    Thanks for the input GearHead!! I'll have to look at that when I get a chance. I was looking at doing a FD-7700, but I'll check out the things you pointed out. Thanks again for the help!

    2006 Kona Leroi


    Quote Originally Posted by azonicrider188a
    well just get your asses some juicy 7s and huck down a mountain. thoose v brakes will snap like my butt

  4. #4
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    Quote Originally Posted by psinsyd
    Thanks for the input GearHead!! I'll have to look at that when I get a chance. I was looking at doing a FD-7700, but I'll check out the things you pointed out. Thanks again for the help!

    Ah, that would be the 9 speed 2 chainring one then. That would only have a capacity of I believe 15T so it won't cover the 22-44 tooth range. Also, it is designed to be used with a chainline of 43.5 mm. Most MTB have between 47.5mm to 50mm chainlines, the derailleur may not be able to travel out far enough to reach the big ring on a MTB crank either.
    There is no added value to my participation - in fact, just more confusion.

  5. #5
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    Why put a road bike fd on at all?
    "...the people get the government they deserve..."
    suum quique

  6. #6
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    Quote Originally Posted by Bikinfoolferlife
    Why put a road bike fd on at all?
    I believe he wants to save the extra weight.
    There is no added value to my participation - in fact, just more confusion.

  7. #7
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    Thanks GearHead!!

    Hey man, thanks a ton for all of your time and input. As you could probably already tell, I'm a relative newb when it comes to setting up a lightweight drivetrain.

    The goal was to use the Dura-Ace front derailleur with the BTP adapter clamp to save as much weight as possible without breaking the bank too much!

    Again, thanks for all of your help!

    2006 Kona Leroi


    Quote Originally Posted by azonicrider188a
    well just get your asses some juicy 7s and huck down a mountain. thoose v brakes will snap like my butt

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