Shimano SM-JC41 Di2 Internal Junction B Box AI We opted for an aluminum

We opted for an aluminum alloy that will bend before breaking

The head is not pressed or bonded in

The new 12-speed Chorus groupset benefits from a new Chorus 12 chain that ensures the same reliability and the same performance levels as that of the Super Record category

The ENVE Water Bottle Cage is light

The Ti-Torque beam now has three separate scales on it

Shimano SM-JC41 Di2 Internal Junction B Box AI We opted for an aluminumFor internal DI2 wire routing, SHIMANO's SM JC41 Junction B is the central connector for DI2 systems. Wires from the front and rear derailleurs, cockpit area, and battery all plug into the 4 port SM JC41 junction, which is housed inside the bike frame. Specifications For internal wire routing Mfr Claimed Weight 4. 1g