The Shimano EW-JC304 is a compact 4-port E-TUBE junction designed for internal routing with the EW-SD300 electric wire system. It allows clean and efficient integration of multiple Shimano STEPS or Di2 components, centralizing connections for simplified wiring and maintenance. This junction is optimized for the EP8 and EP800 series and is built for reliable, high-performance communication between Shimano electronic components.

Key Features:

• Type: 4-port junction for internal wiring

• Compatible Wire: EW-SD300 only (no SD50 ports or connectors)

• Series: Shimano EP8 / EP800

• Purpose: Centralized connection hub for multiple electronic components

• Optimized for Internal Routing: Ensures clean, secure installation

Ideal For:
Riders using Shimano STEPS e-bike systems or SD300-based Di2 setups who want efficient, organized wiring and reliable electrical connectivity.