Choosing an RD
#2
Hoosier Pedaler
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Sure. It is the indexed shifter and cassette that need to match.
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Mandatory disclaimer: If the 8-speed RD is a Dura Ace you have to do some cable attachment rerouting to make it work. If the RD is any other model, you are fine as is.
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Rear deraillers don't have "speeds", they have cable-pull ratio. And all of Shimano's rear deraillers since the first indexed shifting have the same cable-pull ratio. Except for pre-9-speed Dura-Ace, as HillRider noted.
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"c" is not a unit that measures tire width
"c" is not a unit that measures tire width