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  1. #1
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    How to know what derailleur to buy

    last week i broke my rear derailluer hanger but it seems i tweaked the derailleur too as it wont shift smooth anymore even after adjusting it.

    i want to get a new one but i do not know what will fit or work with what i have.

    i have a 2011 specialized hardrock. for drivetrain it has:
    a KMC Z7 w/ reuseable Missing Link chain
    a SR SunTour, square taper spline crank set
    a SRAM PG-730, 7-speed, 12-32t cassette
    and the rear derailleur is a SRAM X.4 8sp Midcage

    i just need a derailleur that works and is on the cheaper side..

    thanks , George

  2. #2
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    Quote Originally Posted by twistedmentality View Post
    last week i broke my rear derailluer hanger but it seems i tweaked the derailleur too as it wont shift smooth anymore even after adjusting it.

    i want to get a new one but i do not know what will fit or work with what i have.

    i have a 2011 specialized hardrock. for drivetrain it has:
    a KMC Z7 w/ reuseable Missing Link chain
    a SR SunTour, square taper spline crank set
    a SRAM PG-730, 7-speed, 12-32t cassette
    and the rear derailleur is a SRAM X.4 8sp Midcage

    i just need a derailleur that works and is on the cheaper side..

    thanks , George
    Any non-10speed SRAM derailleur (long cage) will work.
    mtbtires.com
    The trouble with common sense is it is no longer common

  3. #3
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    even though the one on it is a midcage ?

  4. #4
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    Quote Originally Posted by twistedmentality View Post
    even though the one on it is a midcage ?
    They never made a mid cage X4
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  5. #5
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    What is the difference between the short, mid and long cages?

    This is what came stock on my bike [Shimano LX M581, SGS cage], which SRAM X.9 would I use to upgrade it?

  6. #6
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    Nevermind, I just read the sticky above lol

  7. #7
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    Quote Originally Posted by Lurchlee View Post
    Nevermind, I just read the sticky above lol


    Threw some reputation your way.

  8. #8
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by Lurchlee View Post
    What is the difference between the short, mid and long cages?

    This is what came stock on my bike [Shimano LX M581, SGS cage], which SRAM X.9 would I use to upgrade it?
    If you want to use a SRAM RD you also need to change to a SRAM shifter.
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    The trouble with common sense is it is no longer common

  9. #9
    Fat-tired Roadie
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    Did you get the alignment of the new derailleur hanger checked?

    I've always had good luck with mine, but there are tons of reports of new ones coming out of the box a little crooked. I'd get that checked before replacing the derailleur itself.
    "Don't buy upgrades; ride up grades." -Eddy Merckx

  10. #10
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    Quote Originally Posted by AndrwSwitch View Post
    Did you get the alignment of the new derailleur hanger checked?

    I've always had good luck with mine, but there are tons of reports of new ones coming out of the box a little crooked. I'd get that checked before replacing the derailleur itself.
    Good call. And almost every new hanger is "off" until aligned after install.
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    The trouble with common sense is it is no longer common

  11. #11
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    Quote Originally Posted by shiggy View Post
    Good call. And almost every new hanger is "off" until aligned after install.
    how do you align it ? i thought it would be just puting on the hanger and maybe adjusting the derailleur some.

    and @ shiggy, specialized.com says my bike came with a midgage x4...

    heres the specs page on my bike :

    http://www.specialized.com/us/en/bc/...cname=Mountain

    thanks for the help guys.

  12. #12
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    Quote Originally Posted by twistedmentality View Post
    how do you align it ? i thought it would be just puting on the hanger and maybe adjusting the derailleur some.

    and @ shiggy, specialized.com says my bike came with a midgage x4...

    heres the specs page on my bike :

    http://www.specialized.com/us/en/bc/...cname=Mountain

    thanks for the help guys.
    Park DAG-1 tool. Any good shop has one.

    Must be an OEM spec. No aftermarket mid cage.
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  13. #13
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    mine looks pretty straight. i mean if the new hanger is off its not visible to the eye. is it possible that a minor alignment issue can cause such a headache ?

  14. #14
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    Quote Originally Posted by twistedmentality View Post
    mine looks pretty straight. i mean if the new hanger is off its not visible to the eye. is it possible that a minor alignment issue can cause such a headache ?
    Yes, you can rarely see a misaligned hanger with the naked eye.
    mtbtires.com
    The trouble with common sense is it is no longer common

  15. #15
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    this is my 1st year back into mtb after 2011. i dont remember this stuff being so temperamental.

    i have another question.. when you put the rear tire back on and tighten the skewer down and it pulls the two sides of the frame closer (small amount) could that cause a problem ? technically its moving the derailleur.

    and one more and ill stop.. if you were to restart from scratch on re setting the derailleur what are the default settings so to speak for the screws ?


    thanks again for the help. will post updates.

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