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  1. #1
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    9sp SRAM X-0 and new 10 sp Casettes.

    Hi there, quick one -

    Does 9sp rear derailleur like sram X-0 works with new 10sp casettes?
    Rear derailleur is kinda "dumb" mech leaded by gear shifter, so if I change 9sp shifter to 10sp, rear derailleur shoult still works properly.
    Are new SRAM shifters and derailleur still working in 1:1 system?
    If yes, this should works, em I right?

  2. #2
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    Sad to say.... From my understanding they are not compatible. So you will need to replace both shifter and RD
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  3. #3
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    Quote Originally Posted by rsullivan
    Sad to say.... From my understanding they are not compatible. So you will need to replace both shifter and RD

    Is that because the jockey wheels of the 9sp are just too wide to work with the 10sp chain, or is the actuation ratio slightly different?

  4. #4
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    From my understanding it is the pull ratio. 9 speed- 1:1 10 speed - exact actuation(road bike movement)
    I am sure someone with a more precise answer will pop up soon and post
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  5. #5
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by 006_007
    Is that because the jockey wheels of the 9sp are just too wide to work with the 10sp chain, or is the actuation ratio slightly different?
    Can not mix SRAM 9- and 10-speed derailleurs and shifters.
    The RD geometry in different. For the same amount of cable pull the derailleurs move a different distance.
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  6. #6
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    I can confirm that you cannot mix 9spd and 10spd derailleurs and shifters. I have tried it and it does not work. As mentioned, the cable pull ratio is different.

    I have found that this also affects the front der/shifter - if you're running 2x10 FD then you need the 2spd front shifter, or 3spd shifter for the 3x9/3x10 FD's.

  7. #7
    memento mori
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    I read in another forum,probably drivetrain,that shimano 10 speed shifters will work with 9 speed sram rear deraileurs.I haven't tried it.

  8. #8
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    Quote Originally Posted by DAVID J
    I read in another forum,probably drivetrain,that shimano 10 speed shifters will work with 9 speed sram rear deraileurs.I haven't tried it.

    I doubt that. Shimano's cable pull to pulley movement ratio is higher than sram, and is the same between 9 and 10s.
    you can, at least with Shimano road parts use 10s shifters with a 9s derailleur, brand still has to match though.

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