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  1. #1
    mtbr member
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    Aug 2013
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    10spd front derailleur with 9spd system

    i ordered an slx (fd-m660) as a replacement to my broken acera (fd-m390).
    what i received is a 10-spd front derailleur instead of the 9 speed i ordered.
    before i contact the seller (ebay) and ask for a refund i would like to know if a 10-spd front mech can work with an otherwise 9spd transmission?

    Thanks!

  2. #2
    mtbr member
    Reputation: millertm's Avatar
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    Jul 2012
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    I believe that the 10 speed chain is a bit narrow so your FD might not work with a 9 speed chain. There might not be enough spacing between the FD and the chain. It could also rub when you are in the big rear, chain ring, and your middle chain ring. I would buy the correct one if possible.

    Mark
    2012 XXL Carve Expert

  3. #3
    turtles make me hot
    Reputation: NYrr496's Avatar
    Join Date
    Sep 2008
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    4,331
    Is it two or three rings up front? I've built a few bikes with 2 x 9 with a ten speed front derailleur and it works fine. I could see three rings being a problem.
    I like turtles

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