Product Description
The Shimano EW-RS910 is a compact 2-port Di2 Junction A unit designed to clean up modern electronic drivetrain setups by moving the junction box inside the handlebar or into a compatible frame port. Instead of an external under-stem box, the EW-RS910 tucks neatly into the bar end, leaving only a small faceplate with the charging port, function button, and LED indicators visible.

It is designed for Shimano Di2 E-Tube systems and serves as a key connection point between the cockpit and the rest of the drivetrain. This version supports internal routing for a cleaner cockpit and is also used by some frame manufacturers in dedicated frame-mounted ports.

Key Features

• Genuine Shimano EW-RS910 Di2 junction box
• 2 E-Tube ports
• Functions as Junction A in compatible Shimano Di2 systems
• Designed for drop handlebar / internal frame installation
• Clean bar-end style fit for hidden cockpit routing
• Integrated charging port for Shimano SM-BCR2 charger
• Includes system function button and LED indicators
• Supports battery check, adjustment mode, and crash mode reset functions
• Works with internal cockpit routing for a cleaner look

Specifications

• Brand: Shimano
• Model: EW-RS910
• Product Type: Di2 Junction Box
• Junction Type: Junction A
• Port Count: 2
• Mount Style: Drop handlebar internal / compatible internal frame mount
• Charging Port: Yes
• Manufacturer Part Number: IEWRS910

Compatibility
Compatible with:

• Shimano Di2 E-Tube systems
• SD50 E-Tube wires
• SM-BCR2 charger
• Drop handlebars with internal routing
• Some frames with dedicated EW-RS910 mounting ports

System connection notes:

• Connects within the Di2 system to components such as:
  • Front derailleur
  • Rear derailleur
  • Cockpit junction / shifter wiring
  • Battery mount
• For bar-end setups, the shifters typically connect through an EW-JC130 Y-connector inside the handlebar
• All Di2 components on the bike should use the same firmware version

Additional function notes:

• Button can be used for:
  • Battery status check
  • Derailleur adjustment mode
  • Rear derailleur crash protection reset
  • Bluetooth pairing when used with BT-DN110 battery

Please confirm Di2 system compatibility before purchase.

Included

• Shimano EW-RS910 junction box
• Blank bar-end cover
• Mounting holders
• Dummy plugs for unused E-Tube terminals

Warranty and Notes

• Designed to replace the visible external Junction A with a cleaner internal solution
• Internal routing gives the cleanest result, but it can also be used on handlebars without internal wire routing
• Firmware should match across all Di2 components to avoid system issues
• Includes only what is shown or described

Condition

• New
• Genuine OEM product
• Includes only what is shown or described