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The Shimano 4 Ports Junction is a core component for modern Shimano Di2 electronic shifting systems, designed to neatly connect multiple E-Tube wires in one compact hub. Typically mounted under the stem or inside the frame, this junction box helps organize your cockpit wiring, reducing clutter and improving both aerodynamics and aesthetics. With four available ports, it allows you to link shifters, derailleurs, and other Di2 components in a clean, reliable way, making it ideal for road, gravel, and triathlon builds that demand precise electronic performance.
Engineered to Shimano’s well-known standards, the 4 Ports Junction is built for long-term durability and consistent connectivity in all weather conditions. Its low-profile design integrates seamlessly with most modern frames and handlebars, while the plug-and-play E-Tube interface makes installation and system updates straightforward for mechanics and experienced home builders alike. Whether you are upgrading an existing Di2 setup or planning a new high-end electronic drivetrain, this junction box provides the central connection point you need for smooth, responsive shifting and a professional, tidy cable layout.
