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
All e-tube wires may be used for internal or external applications
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Shimano E-Tube wiresFrame grommets for E-tube internal-wiring compatible frames are sold separately, see Shimano Frame Grommet Kit Electronic Shifter Extra PartsUltegra Di2 wires utilize Shimanos e-tube technology; e-tube is a two-prong system and is NOT cross compatible with Dura-Ace 7970 Di2 wiringAll e-tube wires may be used for internal or external applicationsItem SpecificationsGenre200FD/Shifter CompatibilityDura-Ace 9070 Di2FD/Shifter CompatibilityShimano Ultegra Di2