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  1. #1
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    Are their really 9-speed and 10-speed Shimano front derailleurs?

    So I'm shopping on this website for a front derailleur and see this description for a Shimano SLX M660‑10 Top Swing 10s Front Derailleur:

    - Compatible with Dyna-Sys drivetrains for lightness, tight gear ratios, and efficient chain movement.
    - Swing action is top-swing.
    - Compatible with 10-speed cassettes.
    - Maximum capacity is 18T.
    - Top-middle minimum capacity is 10T.
    - For 42-32-24T.
    - Dual pull cable routing.
    - Chain line 50mm
    - Chain stay angle is 66-69 degrees.
    - Multi-clamp (28.6/31.8/34.9mm).

    I thought all Shimano LX, SLX, XT and XTR front derailleurs didnt care what cassette speed you had?

    And can anyone clarify what they mean by "10T" and "18T" capacities?

    Thanks!

  2. #2
    human dehumidifier
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    I've been wondering the same thing about 9s to 10s compatibility.

    Capacity is the difference in teeth between consecutive rings. You need at least 10t difference in your big and middle rings, and no more than 18t difference between big and middle, and middle and granny.
    I Just Wasn't Made For These Times

  3. #3
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    Quote Originally Posted by wv_bob View Post
    Capacity is the difference in teeth between consecutive rings. You need at least 10t difference in your big and middle rings, and no more than 18t difference between big and middle, and middle and granny.
    Thanks!

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