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  1. #1
    mtbr member
    Reputation: ccaddy's Avatar
    Join Date
    Jun 2006
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    1,715

    R.Derailer cage size on 950 Element ?

    I wanted to upgrade the r derailer (X9) with the X0
    from my last bike but the XO's cage is an inch longer
    so I assume it wont work.
    I believe the XO is a long.
    What size is the 950's.
    Med or short ?

  2. #2
    ups and downs
    Reputation: rockyuphill's Avatar
    Join Date
    Nov 2004
    Posts
    14,006
    RD capacity calculation

    Big chainring teeth - small chainring teeth = max chainring diff

    (example 38 - 24 = 14)

    Big cassette cog teeth - small cassette cog teeth = max cassette diff

    (example 36 - 12 = 24)

    RD max capacity = Max chainring diff + max cassette diff

    (example 24 + 14 = 38) so you need cage based on 38T max capacity

    SRAM says a medium cage is what you'd want for a 2x10.
    I'm a member of NSMBA and IMBA Canada

  3. #3
    Clydesdale Warrior
    Reputation: sh0rty's Avatar
    Join Date
    Jan 2004
    Posts
    155

    Don't see why not...

    My understanding is going longer should not cause problems, might need a longer chain and will have a bigger than necessary cage hanging off the bike... but it should still work fine, you just would not use it's full range of motion.

    Going shorter is what you can't do, years ago a shop replace a smashed long cage XT with a med cage XT on a 3x9 drive train, I did not notice until I maxed-out it's range of motion during a ride. (the shop was good and put the correct length der on after I pointed this out) I have run that same Long cage der on 2x9, even though unnecessary, still works fine.


    sh0rty :P

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