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and an on/off lever that makes it easy to prevent leaks
A high-quality and reliable chain for 8 speed Tour
BM-DN100 long type battery mount with external frame cable routing or internal routing options
• USE CASE: MTB
Shimano E-Tube Di2 External Junction B Box Color:Black and an on/off lever thatShimano 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