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- 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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Review Shimano EW-SD50 Di2 E-Tube Wire, 500mm
