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  1. #1
    Senior Member bluenote157's Avatar
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    are shimano 105 st-5500 9speed or 10speed.

    I've heard that they can accommodate doubles and triples, but can they also be used on a 10speed cassette? how about a mix of rear ultegra rd-6500?

    Thanks!

  2. #2
    Senior Member halfspeed's Avatar
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    They're 9 speed specific. If you want 10-speed you'll need the st-5600.

  3. #3
    Senior Member mattface's Avatar
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    My understanding is that any SIS RD can work with any matching SIS compatible shifter/cassette combo. for instance 6-10 speed. as long as the shifter and cassette match one another, the RD will handle it fine. I've had very good luck using 8 speed rear derailers in 9 speed systems. and older SIS derailers with everything from 6-8. The exception is 6-8 speed dura ace stuff which was different from SIS.

  4. #4
    Year-round cyclist
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    Agreed. See this page by Sheldon Brown (of course).
    Michel Gagnon
    Montréal (Québec, Canada)

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