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Old 01-24-16, 11:06 AM
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Retro Grouch 
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Join Date: Feb 2004
Location: St Peters, Missouri
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Bikes: Catrike 559 I own some others but they don't get ridden very much.

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I'm not sure what, exactly, you are asking but index shifters have to match the number of rear cogs. A 21 speed bike has 7 rear cogs so no.
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