Shimano E-Tube Di2 Internal Junction B Box Fcolourfamily_Red Stay ahead of the pack

Stay ahead of the pack with this out-front bike mount that lets you take full advantage of your Edge's capabilities without compromising your ride

Lizard Skins Frame Protector - Carbon Leather

NiteRider Lumina™ OLED 1200 Boost Front Light

The clamp rotates 360 degrees to get any bike in the perfect position for any repair

One piece forged inner post for strength and reliability

Shimano E-Tube Di2 Internal Junction B Box Fcolourfamily_Red Stay ahead of the packShimano E Tube Di2 Internal Junction B Box The Shimano Di2 SM JC41 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 internally mounted systems for External use SM JC40.