Shimano SM-JC41 Di2 Internal Junction B Box AI Reviewers consistently praise the GP5000

Reviewers consistently praise the GP5000 for its ride quality

The head is not pressed or bonded in

Aero design extends to the shape of the indexed four-position quick release

The 75mm set is optimized for the SES 7

The ENVE Water Bottle Cage is light

Shimano SM-JC41 Di2 Internal Junction B Box AI Reviewers consistently praise the GP5000For 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