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E-Tube Di2 Junction Box
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Warning: California Proposition 65
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).
Details
- 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

Closer to Nature, Closer to People
Shimano supports people to realize their dreams to create new lifestyles that will bring them closer to nature and share the joy of life with each other.
Cancer and Reproductive Harm - P65Warnings.ca.gov
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