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  1. #1
    Junior Member rwperk's Avatar
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    Front shifting a MTB crankset

    Hi,
    I have a Shamano XT FC-M780 crank on a touring bike, the rest of the bike has Ultegra 10 speed with STI shifters.

    I am looking at a XT FD-M781 front derailleur and hoping I can shift it with my STI shifters but worried that the
    Cable pull will be too far off. Does anyone have experience or recommendations on this?

    The M781 uses the new dyna system which I think has different cable pull requirements than the older M761 so if the M781 doesn’t work could the M761 work?

    If none of this works is my only option bar end shifters?

    Thanks in advance for any advice.

  2. #2
    Senior Member Shimagnolo's Avatar
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    STI does not work with mtn FD's.

    To run STI with the smaller mtn chainrings, I recommend this: http://store.interlocracing.com/alfrde.html
    I have it on 2 bikes.

    There is also a lower-end Shimano road FD I've seen recommended, but I forgot which model.

  3. #3
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by Shimagnolo View Post
    STI does not work with mtn FD's.

    To run STI with the smaller mtn chainrings, I recommend this: http://store.interlocracing.com/alfrde.html
    I have it on 2 bikes.

    There is also a lower-end Shimano road FD I've seen recommended, but I forgot which model.
    Tiagra. It's a better derailer for a triple than anything above it. Interestingly, the lower level mountain bike front derailers are better too.
    Stuart Black
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  4. #4
    coprolite fietsbob's Avatar
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    consider Retroshift .. the Front Shift lever, then, is not the STI .. ka thunk .. shifting ,
    but a continuous friction.

    You, then, still can shift from the brake lever Hoods..

    Friction downtube shifter for FD?
    worked for Armstrong..


    [I've just run bar end friction for both sides , my more is better stopped at 7 speeds]
    [x3 chainrings]
    R'off is a 7 speed IGH , used twice.. dual range..
    Last edited by fietsbob; 05-10-13 at 10:14 AM.

  5. #5
    imi
    imi is offline
    aka Timi imi's Avatar
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    Front shifting a MTB crankset

    Friction downtube shifter for FD?

  6. #6
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by imi View Post
    Friction downtube shifter for FD?
    Why? rwperk seems to have full functional shifter for the front derailer and all he needs is a derailer that works with it.
    Stuart Black
    Solo Without Pie. The search for pie in the Midwest.
    Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
    Days of Wineless Roads. Bed and Breakfasting along the KATY
    Twisting Down the Alley. Misadventures in tornado alley.
    An Good Ol' Fashion Appalachian Butt Whoopin'.

  7. #7
    Senior Member drrobwave's Avatar
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    Derailluers do what the shifters tell them to do as long they are shimano compatible - the dyna system is an exact shift system and will not work, so get the m780 or the m771. Tiagra triple is as good if not better than the XT IMHO. I intermix mtb and road bike parts all the time with no problems - I even have my saga set up with XT rear derailleur low normal and ultegra bar ends and other than shifting in the oposite direction it shifts as good or better than anything I got.
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