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  1. #1
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    Which Rear Derailleur?

    I need to get a new rear derailleur for my wife's bike and I was looking at competitive cyclist and they have a good deal on a Shimano XT. Is it possible to just throw that on the bike even though it has full X7? If so is it worth it, or should I just get an X7?

    Thanks

    Rear Derailleur
    Shimano XT Dyna-Sys RD-M781 Rear Derailleur - Competitive Cyclist

    Bike Specs (it has an X7 front derailleur)
    2011 X-Caliber WSD - Bike Archive - Trek Bicycle

  2. #2
    Nouveau Retrogrouch SuperModerator
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    Which Rear Derailleur?

    Quote Originally Posted by BrianVarick View Post
    I need to get a new rear derailleur for my wife's bike and I was looking at competitive cyclist and they have a good deal on a Shimano XT. Is it possible to just throw that on the bike even though it has full X7? If so is it worth it, or should I just get an X7?

    Thanks

    Rear Derailleur
    Shimano XT Dyna-Sys RD-M781 Rear Derailleur - Competitive Cyclist

    Bike Specs (it has an X7 front derailleur)
    2011 X-Caliber WSD - Bike Archive - Trek Bicycle
    Get another SRAM 10-sp RD
    You can not mix Shimano rear derailleurs and SRAM shifters or vice versa.
    mtbtires.com
    The trouble with common sense is it is no longer common

  3. #3
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    ^Oh ok, that's good to know Is there anyway to know whether her bike had a short medium or long cage?

  4. #4
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    Typically if it has a triple crank on it, then get a long cage. If it has a double or single then a medium usually would work. Short if she has a single chainring and smaller range on her cassette (no bigger than 28 or 32ish)

  5. #5
    ragley blue pig x
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    Re: Which Rear Derailleur?

    Im not trying to overcomplicate things BUT what about derailleurs for 11/36 cassettes....

  6. #6
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    Price the x9 type 2 RD. It's really quite and quick enough for about anyone. I run it with x7shifters and have had zero issues. Not sure the price difference of x7, if its close go with x9.

  7. #7
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    Quote Originally Posted by manbat View Post
    Im not trying to overcomplicate things BUT what about derailleurs for 11/36 cassettes....
    From The derailleur at CC link
    The length of the cage determines the overall chain-wrap capacity, or more simply put, how big of a tooth difference it can accommodate between the biggest gear and the smallest gear. Total difference can be found with this equation: big ring - small ring + big cog - small cog. For example, the long cage (SGS) option will work with a 24/32/42 tooth chainring configuration (18t difference) plus an 11/36 cassette out back (25t difference). This meets the maximum chain-wrap capacity of the long cage derailleur at 43t. The Short length cage (GS) has a chain-wrap capacity of 35t and could be used for a single or double ring/bash-guard set-up as the 11/36 (25t difference) plus the 24/32 chainring (8t difference) does not exceed its range.
    Duct tape iz like teh Force. It has a Lite side and a Dark side and it holdz the Universe together.

  8. #8
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    XT shadow+.

  9. #9
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by manbat View Post
    Im not trying to overcomplicate things BUT what about derailleurs for 11/36 cassettes....
    Any 10-sp long cage SRAM.
    mtbtires.com
    The trouble with common sense is it is no longer common

  10. #10
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by hammy56 View Post
    XT shadow+.
    Ummm...no. You need to pay attention.
    mtbtires.com
    The trouble with common sense is it is no longer common

  11. #11
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    oops. lol.

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