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
