The Shimano Nexus SG-C7050-5D is a Di2 electronic 5-speed internal gear hub built specifically for e-bikes with mid-drive motors. Purpose-engineered to handle the higher torque loads and pedalling forces generated by pedal-assist systems, it brings the reliability of a sealed internal drivetrain together with Shimano's Di2 digital shifting — letting riders shift automatically or at the touch of a button, with no exposed cables or derailleur to maintain.

Highlights

• E-bike dedicated design: Built to withstand the higher pedalling torques of mid-drive motor systems — shifting reliably under loads 3× heavier than the previous SG-C6000 series hub.
• Di2 electronic shifting: Integrates with Shimano's Di2 digital system for automatic or manual gear selection, eliminating mechanical shift cables entirely.
• 263% total gear range: The INTER-5E gear mechanism delivers a wide spread across 5 speeds, suited to the varied terrain of urban commuting and e-bike riding.
• Fully sealed internals: Weather-protected gear mechanism requires no lubrication of exposed drivetrain components — ideal for all-weather commuter and city use.
• Centre Lock disc interface: Spline-mount rotor fitting for fast, precise rotor installation compatible with standard Shimano Centre Lock rotors.
• Strong 36-hole flange: High spoke count for a robust wheel build that handles the weight and load demands of e-bike commuting.

E-Bike Integration

The SG-C7050-5D is part of the Shimano STEPS C7050 hub family, developed in tandem with Shimano's E5000 and E6100 mid-drive motor systems. When paired with a compatible STEPS drive unit, junction unit, and Di2 battery, the hub can shift automatically based on cadence and speed — removing gear-selection effort from the rider entirely. The gear mechanism has been engineered for 50% greater durability versus the SG-C6000 series and handles the increased shifting forces that electric assist creates.

Compatibility & Fit

5-speed internal gearing with Di2 electronic shifting. Rear dropout spacing (O.L.D.): 135mm. Axle length: 187mm. Axle type: 10mm nut-type. Spoke holes: 36H. Brake interface: Centre Lock disc. Designed for use with Shimano STEPS E5000 and E6100 series mid-drive motors and a compatible Di2 battery and junction unit (sold separately). Weight: 1670g.