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  1. #1
    Retro-nerd georgiaboy's Avatar
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    I am building a bicycle with Ultegra double on the front with XT on the rear. The cassete will be
    XT 11-34. In shopping for the right XT derailleur I found 3 different ones.

    They are:

    Mid-cage(M-760 GS 9-speed), Long Cage (M-760 SGS 9-speed), and Top Normal (M-751 SGS).

    Which one should I use?

    What are the differences?

    Thanks

  2. #2
    Senior Member sydney's Avatar
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    You match cage length to the total wrap capacity you neeed. Top normal or hi normal is the way a convention RD works: with no cable attached the derailer spring pulls it to the small cog position.

  3. #3
    'Mizer Cats are INSANE Mentor58's Avatar
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    Quote Originally Posted by sydney
    You match cage length to the total wrap capacity you neeed. Top normal or hi normal is the way a convention RD works: with no cable attached the derailer spring pulls it to the small cog position.
    And if you plan on using brifters, you probably want to go with the high-normal one. That way the brifters will shift normally. If you go with the 'low-normal' they will work, but things will be backward from normal. (ie, if you sweep the brake lever, you will end up in the higher gears, and the trigger will shift to the lower gears)

    Steve W.
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  4. #4
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    Your chain wrap needs are (53-39) + (34-11) or 37 total teeth. Use the rear derailleur that has at least that capacity and will clear a 34T cog. Shimano's specs should let you pick the suitable model.

  5. #5
    Retro-nerd georgiaboy's Avatar
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    Thanks for the replies. I have been checking on some specs for other builds and it seems I should move down to a 11-32 cassette. This information is very helpful. I have never noticed "chain wrap" or "hi, low, normal" before.

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