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Shimano
E-Tube Di2 Junction Box

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$20.45 - $32.99
Up to 38% off

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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