Shimano E Tube Di2 Junction Box

Shimano E Tube Di2 Junction Box

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 JC40 and External SM JC41.

Best Price:  $20.95 on sale  from  Backcountry
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Backcountry $20.95 on sale$29.95 See It
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