Shimano'S E-Tube Di2 Junction Box (Also Known As The B Junction) Connects All Your Component And Battery Wires To Make Assembly Much Easier. It'S A Crucial Item Along With The Five Required Wire Sections To Operate Your Ultegra 6770 Ultegra 6870 Or Dura-Ace 9070 Di2 Shift System. The E-Tube Di2 Junction Box Is Available In Two Configurations: Internal (Sm-Jc41) And External (Sm-Jc40).
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