SHIMANO SM-JC41 Junction - 4-Port for internal wiring

SHIMANO SM-JC41 Junction - 4-Port for internal wiring • Junction Box for Shimano Ultegra Di2 cable EW-SD50 with internal routing. • Front/rear derailleur, cockpit area and battery are connected here. • The Shimano SM-JC41 Rear Junction connects all of the Ultegra Di2 electronic components to the battery unit. • It also serves as the interface between the Front Wire/Junction, which transmits data from the controls, and the Di2 Derailleurs. • Available in two versions: SM-JC40 for externally routed wires, which mounts under the bottom bracket shell, and SM-JC41 for internally routed wires, which mounts inside the down tube just above the bottom bracket shell. • All electronic wires (EW-SD50) are sold separately. • Note: Neither the SM-JC40 or SM-JC41 Rear Junction is compatible with Dura-Ace Di2 components.