Box Four 8S Derailleur and Shifter Elegant It features a Battery Management

It features a Battery Management System (BMS) and is constructed with Samsung cells arranged in series

helping effectively reduce vibration and fatigue

Portability: Designed with a widened handle for comfortable lifting and multiple Hook & Loop straps for easy mounting to a rear rack

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Box Four 8S Derailleur and Shifter Elegant It features a Battery ManagementBox 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 constant 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.