Shimano EW-RS910 Junction Box A

The Shimano EW-RS910 Junction Box A is a compact Di2 junction unit designed to integrate seamlessly into modern road bike cockpits. Commonly mounted in compatible handlebars or frame openings, it serves as a central connection point within Shimano’s E-Tube electronic shifting system while providing convenient access to charging and system diagnostics.

The EW-RS910 connects key Di2 components through Shimano E-Tube SD50 wiring, enabling reliable communication between shifters, derailleurs, battery, and other electronic system elements. Its low-profile design helps maintain a clean, integrated appearance while supporting the performance and reliability expected from Shimano Di2 drivetrains.

In addition to serving as a wiring hub, the EW-RS910 functions as the charging and diagnostic port for compatible Di2 systems. As with all Shimano Di2 components, maintaining matching firmware versions across the system is essential for proper operation and performance.

Key Features

• Integrated Di2 Junction Box – Central connection point for Shimano E-Tube electronic shifting systems
• Charging & Diagnostic Access – Provides convenient interface for charging and system updates
• Compact Cockpit Integration – Low-profile design fits compatible handlebars and frame-mounted locations for a clean appearance