Shimano EW-JC130SS Di2 E-Tube Wire, Y-Split, 350/50/250mmShimano E Tube wires and connectors Product Details: All e tube wires may be used for internal or external applications Frame grommets for E tube internal wiring compatible frames are sold separately, see Shimano Frame Grommet Kit Electronic Shifter Extra Parts Ultegra Di2 wires utilize Shimano's e tube technology; e tube is a two prong system and is NOT cross compatible with Dura Ace 7970 Di2 wiring
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