Shimano ZEE RD-M640 Shadow Plus Rear Derailleur


Chain slap is something we all have to live with, but Shimano’s ZEE RD-M640 Shadow Plus makes it a whole lot less cringe-inducing by including its now-famous clutch technology. By increasing spring tension when it’s engaged, the clutch reduces slap and the risk of dropping a chain, making it a…

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