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  1. #1
    On Two Wheels sam83's Avatar
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    ST6603 ompatibility

    From the Shimano website, it appears that the triple brifter ST6603 will not work with a double crank / front deraileur. Is this true? I'm pretty sure that my 9 speed Ultegra (ST6510?) works with either.

  2. #2
    The Red Lantern Rev.Chuck's Avatar
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    The nine speed is double/triple. The 10 speed is not, according to my stuff.. I have not tried a triple(6603) shifter on a double crank, but I don't think it will throw the right amount to work right.
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  3. #3
    Senior Member
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    The 9-speed Ultegra and 105 were the only Shimano groups (AFAIK) that had shifters that worked with both double and triple cranks. The 8-speed components had specific double or triple shifters and, I believe Shimano has gone back to that for 10-speed.

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