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Shimano E-Tube Di2 External Junction B Box

$29.69 Was $32.99 Save 10%

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Product ID: 71203

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keyboard_arrow_right Description

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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