The Shimano MU-UR520 brings full Di2 electronic shifting to NEXUS and ALFINE internally geared hub e-bikes, making smooth and automatic gear changes a reality for commuters and urban riders. Simply bolt it on in place of the MU-UR510, connect to your E-TUBE system, and let the bike do the work.

Highlights

  • Di2 electronic shifting: enables precise, automatic gear changes on NEXUS INTER-5E/8 and ALFINE INTER-11/8 internally geared hubs.
  • AUTO SHIFT: the system selects gears automatically to maintain your chosen cadence, reducing effort on commutes and stop-start city riding.
  • Belt and chain compatible: works with both belt drive and chain drive setups for a clean, low-maintenance drivetrain.
  • Wireless LED indicator and function button: clear, intuitive feedback and control at a glance.
  • Bosch BSE3 integration: connects to compatible Bosch drive units via the EW-PS300 electric power supply wire.
  • MU-UR510 replacement geometry: maintains the same belt and chain line clearance as the previous MU-UR510 for easy, direct-fit installation.
  • E-TUBE PROJECT Cyclist app: adjust AUTO SHIFT settings, update firmware, and personalise the system via smartphone.

Smart shifting for urban e-bikes

AUTO SHIFT removes the need to think about gear selection — the MU-UR520 monitors speed and cadence and shifts within the internally geared hub to keep you pedalling efficiently. Whether you are cruising along a shared path or navigating stop-start intersections, the system adapts in real time. Manual Di2 shifting is always available when you want to override.

Low-maintenance drivetrain options

Support for belt drive means riders who want a quiet, grease-free drivetrain can pair the MU-UR520 with a compatible internally geared hub and belt system. Chain drive is equally supported, giving builders and bike fitters the flexibility to spec the drivetrain that suits the application.

Compatibility & Fit

The MU-UR520 is compatible with the following Shimano internally geared hubs: SG-S7051-11 (ALFINE 11-speed), SG-S7051-8 (ALFINE 8-speed), SG-C6061-8 (NEXUS 8-speed), and SG-C7050-5 (NEXUS 5-speed). For Bosch BSE3 e-bike integration, the EW-PS300 electric power supply wire is required. System configuration and firmware updates are managed through the E-TUBE PROJECT Cyclist app. Confirm full hub, battery, and Di2 system compatibility before fitting.

Shimano offers a limited warranty covering defects in materials and workmanship. For warranty support, return the item to Tune Cycles.
  • Enables Di2 electronic shifting on NEXUS INTER-5E/8 and ALFINE INTER-11/8 internally geared hubs
  • AUTO SHIFT automatically selects gears to maintain a consistent, comfortable cadence
  • Compatible with belt drive and chain drive drivetrains
  • Wireless LED indicator and function button for intuitive on-bike operation
  • Connects to compatible Bosch BSE3 drive units via EW-PS300 power supply wire
  • Direct replacement for MU-UR510 — identical belt/chain line clearance for straightforward installation
  • Configure, customise, and update via the E-TUBE PROJECT Cyclist smartphone app
Part NumberMU-UR520
Compatible Speeds11 / 8 / 5-speed
Compatible HubsSG-S7051-11, SG-S7051-8, SG-C6061-8, SG-C7050-5
Hub SeriesSHIMANO ALFINE, SHIMANO NEXUS
Drive TypeBelt drive and chain drive compatible
Shifting SystemShimano Di2 electronic
AUTO SHIFTYes
External IntegrationBosch BSE3 (via EW-PS300 wire)
App CompatibilityE-TUBE PROJECT Cyclist (iOS / Android)
LED IndicatorWireless LED indicator with function button
PredecessorMU-UR510 (same belt/chain line clearance)
SKU SHM-IMUUR520BA
Barcode # 4550170313036
Brand Shimano

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