Shimano Di2 e-Tube Wires E-Tube Di2 wires form the connections of a Di2 system. Shimano's E-tube technology, is a weather-sealed system that allows multi-compatibility and expandability of the Di2 system. Connectors easily click securely into place (always use the approved Di2 wiring Tool) and allow quick install of Di2 e-Tube components. Note: 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 Compatible with: Shimano Dura-Ace 9070 Ultegra 6770 and 6870 XTR M9050 Dura-Ace R9170 and R9150. Alfine S705 and S505 | Shimano Di2 Ew-Sd50 E-Tube Wires Black, 300mm