Shimano E-Tube Di2 External Junction B Box


Product ID: 71203

Earn rewards points on this item / Learn More

Only 1 Left - Ready to ship


Shop all Shimano   |   Shop all Electronic Gear Shifting

  • Hassle free
    365 Day Returns
  • Safe and Secure
    for peace of mind
  • Pay by Card, PayPal, Apple Pay & Google Pay

keyboard_arrow_right Description

Shimano E-Tube Di2 External Junction B Box

The Shimano Di2 SM-JC40 is designed to connect SD50 E-tube wires along four points; front derailleur, rear derailleur, cockpit junction and battery mount.

The B-Box is used to split the main wire from Junction A to the front and rear derailleurs. It can also be used to connect a seatpost mounted battery to the system.

Specifically designed for externally mounted systems and mounts underneath bottom bracket shell - for External systems use SM-JC41

keyboard_arrow_right You Might Also Like

keyboard_arrow_right Ratings & Reviews