Feature

●Crankset Compatibility: 2 x 10
●Compatible Components: Shimano Ultegra Di2
●Recommended Use: ditching your mechanical tethers
●Actual Weight Notes: Weight is for Di2 Junction B.
●International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.


Description

Shimanos E-Tube Di2 Junction Box (also known as the B junction) connects all your component and battery wires to make embly much easier. Its 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).