ShimanoE-Tube Di2 Junction Box
Item # SHI0394
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Where the wires converge.
The E-Tube Di2 Junction Box is what is referred to as the B Junction. This is the point in the wiring system where all the component pieces converge. 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). The Internal style is designed to be located inside the bike frame (usually inside the down tube, tucked in from a hollow bottom bracket shell). The External version is designed to be fixed on the outside of the bottom bracket shell, usually fastened to the cable guide.
- 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
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What do you think about this product?
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September 17, 2019
Woohooo!!!!
Arrived fast and work great..!!! So I can ride my bike today! YES! The price are spectacular!
rha102442512
January 8, 2018
A box with plugs
- Familiarity:
- I've put it through the wringer
Just try and use your Di2 system without it, I dare you.
Charissa Olsen
March 7, 2017
Works well.
- Familiarity:
- I've put it through the wringer
Works great, make sure to plug any unused ports (like in 1x setups) with the shimano di2 port plugs, or else water will get in and short it out.
Luke Dordai
June 25, 2016
Gotta Have It
- Familiarity:
- I've put it through the wringer
It's a necessity!
Hap Seliga