product_title: SHIMANO Ultegra Di2 Internal Routing Junction Box
product_description: 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).
product_bullet_point: Crankset Compatibility: 2 x 10
  Compatible Components: Shimano Ultegra Di2
  Recommended Use: ditching your mechanical tethers
  Manufacturer Warranty: 2 years
  Actual Weight Notes: Weight is for Di2 Junction B.
product_brand: SHIMANO
product_text: SHIMANO Ultegra Di2 Internal Routing Junction Box
  SHIMANO
  One Color
  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).
  Crankset Compatibility: 2 x 10
  Compatible Components: Shimano Ultegra Di2
  Recommended Use: ditching your mechanical tethers
  Manufacturer Warranty: 2 years
  Actual Weight Notes: Weight is for Di2 Junction B.