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Shimano E-Tube Di2 External Junction B Box
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Product details
| Management number | 236547013 | Release Date | 2026/07/09 | List Price | $11.60 | Model Number | 236547013 | ||
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| Category | |||||||||
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
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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