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  1. #1
    Senior Member
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    Jul 2010
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    Tiagra shifter, can it handle a triple crank?

    I have a Tiagra shifter and a double crank. Can the shifter be adjusted to use a triple? If so, how?

  2. #2
    Low car diet JiveTurkey's Avatar
    Join Date
    Aug 2007
    Corvallis, OR, USA
    My Bikes
    2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
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    It may or may not be triple compatible. ST-4500 and 4503 will work with either double or triple. ST-4501 will work only with a double. If you can't find a model number, you can test yourself. Downshift all the way, disconnect the cable at the front derailleur, and see how many upshift sweeps you can make with the brake lever/shifter. For a triple, you need to be able to make two full sweeps, not counting any trim shifts you may feel/hear.

    What are you trying to accomplish? If converting a bike from double to triple, there will be a lot of things to change over.
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