Join Date: Aug 2005
Location: Awesome, Austin, TX
Bikes: Specialized Roubaix, Interloc Impala, ParkPre Image C6
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The reason it will work is that derailleurs move continuously through the range of motion allowed by the hi and low set screws. It's the indexed shifter that determines how far it moves per click. The important match is between the shifter and the cassette.
2014 Specialized Roubaix2003 Interloc Impala2007 ParkPre Image C6 (RIP)