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  1. #1
    Senior Member
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    Does anybody know what the largest chainring a 2004 shimano 105 front derailler can handle. My current crank set up is 53-39.

    CAn I go to a 54 or 55 or even 56(for downhill gearing)?

  2. #2
    DEADBEEF khuon's Avatar
    Join Date
    Aug 2002
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    Catching his breath alongside a road near Seattle, WA USA
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    1999 K2 OzM, 2001 Aegis Aro Svelte
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    Shimano's webpage says 56T is the largest you can go with a difference of 15T meaning you would need to run a 41T inner ring.
    1999 K2 OzM 2001 Aegis Aro Svelte OCP Club Member
    "Be liberal in what you accept, and conservative in what you send." -- Jon Postel, RFC1122

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