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Shimano E-Tube Di2 External Junction B Box

Shimano E-Tube Di2 External Junction B Box 68405300

USD $8.91

Color Black

  • Black

Option Each

  • Each

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Shimano E-Tube Di2 External Junction B Box
8.91
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Shimano E-Tube Di2 External Junction B Box

The Shimano Di2 SM-JC40 is designed to connect SD50 E-tube wires along four points; front derailleur, rear derailleur, cockpit junction and battery mount.

The B-Box is used to split the main wire from Junction A to the front and rear derailleurs. It can also be used to connect a seatpost mounted battery to the system.

Specifically designed for externally mounted systems and mounts underneath bottom bracket shell - for External systems use SM-JC41

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