This is a Shimano Ultegra Di2 EW-SD50 Extension ...
Wire for all Di2 systems except Shimano 7970 Dura Ace. All e-tube wires may be used for internal or external applications Frame grommets for E-tube internal-wiring compatible frames are sold separately Ultegra ...
Pretty straight forward here, the Shimano EW-JC302 allows you ...
s you to connect 2 E-tube wires together without the use of a junction box. Female to female design can also be used to extend E-tube length by linking wires together. This junction is ...