The Shimano SM-EW90-A Junction A is a 5-port E-TUBE junction box designed for under-stem mounting, providing a central hub for Shimano DI2 electronic shifting systems. It allows clean, organized connections of DI2 shifters, accessory shifters, and the downtube junction wire.

Key Features:

• Model: SM-EW90-A

• Type: Junction A – E-TUBE

• Port Count: 5 Ports

• Mount: Under-stem mount

• Integrated battery level indicator

• Built-in charging port for DI2 battery

• Gear index setup switch for precise electronic tuning

• Compatible with Shimano DI2 systems

Ideal For:
Cyclists looking to centralize DI2 connections with easy access for charging, tuning, and monitoring battery status, all while maintaining a clean cockpit setup.