It’s time to connect.
Shimano’s E-Tube Di2 Junction Box (also known as the B junction) connects all your component and battery wires to make assembly much easier. It's a crucial item along with the five required wire sections to operate your Ultegra 6770, Ultegra 6870, or Dura-Ace 9070 Di2 shift system. The E-Tube Di2 Junction Box is available in two configurations: Internal (SM-JC41) and External (SM-JC40).
- Connects Di2 cycling component and battery wires
- Available in external or internal configurations
- Shimano's Di2 is the most popular electronic drivetrain in the pro ranks
- Item #SHI0394
- Crankset Compatibility
- 2 x 10
- Compatible Components
- Shimano Ultegra Di2
- Recommended Use
- ditching your mechanical tethers
- Manufacturer Warranty
- 2 years
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Cancer and Reproductive Harm - P65Warnings.ca.gov