Box Four 8S Derailleur and Shifter

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Box Four 8 speed wide rear clutch derailleur and Box Four 8 speed shifter bundle. The Box® Components rear derailleur boasts a limited-slip clutch with instant engagement and const ant torque which prevents dropped chains and minimizes chain slap. Highly recommended for any mid-drive electric bike and is an excellent upgrade over the traditional Shimano drivetrain. Show more