Shimano SM-JC41 Di2 Internal Junction B Box Groupe Carbon fiber is the ideal

Carbon fiber is the ideal material for a gravity bar because fiber orientation and bar shape can be controlled independently and developed in unison

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and upper tube strong enough to withstand 325 foot-lbs of torque

thanks to the matching dimensions and complete compatibility with wheels and frames

0mm Thickness

Shimano SM-JC41 Di2 Internal Junction B Box Groupe Carbon fiber is the idealFor 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