Shimano EW-JC304 Di2 Junction Box - 4 Ports for EW-SD300

Discover the Shimano EW-JC304 Di2 Junction Box, designed to enhance your cycling experience with seamless connectivity. This premium junction box offers a reliable solution for connecting various Di2 components, ensuring optimal performance on every ride.

• Connects via SD50 E-tube wires to four key points: front derailleur, rear derailleur, cockpit junction box, and battery mount.
• Ensures all Di2 components operate with the same firmware version to prevent malfunctions.
• Facilitates easy updates to component firmware using the Di2 system checker.
• Constructed with high-quality materials for durability and long-lasting performance.
• Compact design allows for easy installation and integration into your bicycle setup.

This junction box is ideal for cyclists looking to optimize their Di2 system. Simply connect the appropriate E-tube wires to the designated ports, ensuring all components are updated and functioning harmoniously. Perfect for both casual riders and competitive cyclists.