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Old 01-01-21, 10:44 AM
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looked up the zee der. Is it possible you might have the DH version? "There are two versions of Shimano's ZEE RD-M640 Shadow Plus Rear Derailleur: a Downhill (DH) for 28t-max cassettes, and a Freeride (FR) for up to 36t-max cassettes."
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