SHIMANO Ultegra Di2 Internal Routing Junction Box
Brand: SHIMANO
Color: One Color
Categories: Sports & Outdoors, Sports, Cycling, Parts & Components

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.

Item Package Dimensions L x W x H: 4.4 x 2.2 x 1.3 inches
Package Weight: 0.03 Pounds
Item Dimensions LxWxH: 3 x 4 x 2 inches
Brand Name: SHIMANO
Color: One Color
Number of Items: 1
Manufacturer: Shimano
Part Number: SH4255
Model Year: 2012
Size: Internal/SM-JC41
Sport Type: Cycling
Date First Available: July 21, 2011