Bicycle Mechanics - are shimano 105 st-5500 9speed or 10speed.

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bluenote157
07-23-07, 05:37 PM
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!

halfspeed
07-23-07, 06:32 PM
They're 9 speed specific. If you want 10-speed you'll need the st-5600.
mattface
07-23-07, 07:13 PM
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.

Michel Gagnon
07-23-07, 10:37 PM
Agreed. See this page (http://sheldonbrown.com/speeds.html) by Sheldon Brown (of course).