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  1. #1
    NE Roadie
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    Can I use an XT/XTR RD with a road bike ?

    I posted the same question on different forum but I'd like to get your opinions.
    I want to install a 34T cassette and a mountain bike RD (probably an XT or XTR) on my road bike with 10 speed DuraAce group. Can I do that and are there any gotchas in doing so. Thanks.

  2. #2
    Too Much Crazy
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    10 speed shifters do not work with 9 speed cassettes. If you had 9 speed shifters it would work.

    AFAIK, there are no 10 speed mountain cassettes yet (or hopefully ever)

  3. #3
    pedal head
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    Quote Originally Posted by Curt Kurt View Post

    AFAIK, there are no 10 speed mountain cassettes yet (or hopefully ever)
    +1
    [SIGPIC]http://i134.photobucket.com/albums/q82/probable556/BF_Sig_Small2Custom.jpg[/SIGPIC]

  4. #4
    Senior Member comoto's Avatar
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    Why not? If you adjust the stop right for the 9th gear the shifter will never go past 9. Done it several times. DA? this is on a road bike right? Keep your 10 speed chain for your front sprocket spacing to be correct. You are going to have to experiment with
    cable pull adjustments to get it indexing right.

    G

  5. #5
    Too Much Crazy
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    ^ hmm. that is interesting. I always thought that 9 speed spacing (2.56mm) was different enough from 10 speed spacing (2.35mm) that you wouldn't get correct shifting when combining the 10 speed index shifters and 9 speed cassettes.

    I guess I stand corrected

  6. #6
    Senior Member late's Avatar
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    Even if worse comes to worse, you could get a 9 speed right hand brifter.

    Btw, I have that arrangement, XT rear der, 34T cassette, brfiters. It's nice when
    things get really steep.

  7. #7
    NE Roadie
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    Quote Originally Posted by comoto View Post
    Why not? If you adjust the stop right for the 9th gear the shifter will never go past 9. Done it several times.
    When you say "the stop right", is that the like limit screw on the XT/XTR RD.

    Quote Originally Posted by comoto View Post
    DA? this is on a road bike right? Keep your 10 speed chain for your front sprocket spacing to be correct. You are going to have to experiment with cable pull adjustments to get it indexing right.
    Yes, this is road bike which I am trying to convert into a climbing bike. Would the 10 speed chain work with the 9-speed XT cassettes ? Eventually I plan to change the front to go to a lower gearing (probably a triple) but that is an entirely different story.

  8. #8
    Newbie erhan's Avatar
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    Quote Originally Posted by comoto View Post
    Why not? If you adjust the stop right for the 9th gear the shifter will never go past 9.
    yea it won't, but it's like not using one gear of a 10 speed cassette. The OP basically asks if a 9 speed cassette can be used with 10 speed shifters. The answer to that is "no", because the spacing is different (Curt Kurt gave the numbers above). 10 speed and 9 speed cassettes are the same width, and it actually has nothing to do with adjusting the stops.

    edit: I thought again, and actually it may be possible. The chain will be about 1 mm off at each end of the cassette if the derailleur is adjusted perfectly for the middle cog, which will cause some rubbing and noise.
    Last edited by erhan; 08-20-07 at 09:09 AM.
    Giant Anthem
    Cannondale Synapse

  9. #9
    biked well well biked's Avatar
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    There's a way to get the ten speed shifters to move the RD a little further with each click. From Sheldon's site:

    http://www.sheldonbrown.com/gloss_aa-l.html#alternate

    Whether it works perfectly, YMMV.

    And there are IRD ten speed "mtb" cassettes. Expensive, and I personally see no need for them, but they're out there-

  10. #10
    Senior Member
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    I have a cross bike set up exactly this way, with an XT rear derailleur and 9 speed Ultegra shifters, 11-32 cassette. Works beautifully! I'm going to ride that setup in a very hilly race coming up as well.

    If you have a 10 speed bike (I don't think the OP specified) you can get a 29 tooth big cog fairly cheaply and make a custom "bailout gear" cassette; I have a friend who's done that.
    Kendall Frederick

    Orange Park, FL

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