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  1. #1
    Senior Member mynameistaken's Avatar
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    Will mountain bike shifters work with a road cassette + RD?

    I have a 2004 mountain bike that I am considering turning into a commuter with some spare parts. (Currently 9 speed and heavily worn) Before I start taking everything apart I wanted to know if these parts were compatible.

    Shimano 105 RD, 105 12-25 Cassette 10spd with new XT 780 shifter or SLX 10 speed.

    I don't own the shifters but might buy them if they are compatible.

    Will XT and 105 work OK?

  2. #2
    Junior Member
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    I have a 2012 Trek 8.5 DS hybrid with XT/SLX shifters and derailleurs and a wide range cassette (SRAM PG950). I recently had my LBS change the cassette to an SRAM PG970 (11-21 road cassette). After a little bit of derailleur adjustment things are good, mush less "crunching", but my LBS did suggest that I change the rear derailleur for something with a shorter arm. I don't know what improvement that would give me, but, we'll see, maybe next year.

  3. #3
    You gonna eat that? Doohickie's Avatar
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    Quote Originally Posted by namtnulb View Post
    my LBS did suggest that I change the rear derailleur for something with a shorter arm. I don't know what improvement that would give me
    If it works, don't fix it. As long as you're happy with the rear shifting, leave it be.
    I stop for people / whose right of way I honor / but not for no one.



    Originally Posted by bragi "However, it's never a good idea to overgeneralize."

  4. #4
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by mynameistaken View Post
    I have a 2004 mountain bike that I am considering turning into a commuter with some spare parts. (Currently 9 speed and heavily worn) Before I start taking everything apart I wanted to know if these parts were compatible.

    Shimano 105 RD, 105 12-25 Cassette 10spd with new XT 780 shifter or SLX 10 speed.

    I don't own the shifters but might buy them if they are compatible.

    Will XT and 105 work OK?
    With those shifters, no. The shifters are "Dyna-Sys" compatible, which means you need a Dyna-Sys rear derailleur to make it work. For the 105 rear derailleur and 10-speed, you need not-Dyna-Sys shifters, such as the R770: http://harriscyclery.net/product/sl-...d7013-qc49.htm (note the price).

    Are the shifters on the MTB worn out? If they still work OK, it's probably cheapest to replace the chain and cassette with new 9-speed stuff.
    Jeff Wills

    All my bikes.

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