Shimano SM-JC41 Internal Junction Box

The Shimano SM-JC41 Junction Box is a key component of Shimano’s Di2 electronic shifting system, connecting multiple E-tube wires internally. Compact and reliable, it ensures clean wiring and consistent signal transfer for flawless Di2 operation.

Key Features

• 4-port internal junction box for Di2 systems.

• Connects shifters, derailleurs, and battery units.

• Compact, lightweight design.

• Reliable E-tube connectivity.

• Essential for internal routing setups.