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The Shimano 1st Gen E-Tube Di2 Wire plays an integral and important role in assembling your 6770, 6870, or 9070 Di2 group. Without it, you can't install your Di2 derailleurs, shifters, or battery. So, check the size chart on this page for length, and don't worry about the rest. If you're running Ultegra 6770 or 6870, or Dura-Ace 9070, this E-Tube Di2 Wire will connect up all the moving parts. Its connectors are the same, regardless of application, so all you have to do is choose the length that's best suited. Newly designed thin electronic wire and connector E-tube transmits interactive signals and power supply to each part Water-resistant connector UPC 689228828179 Color Black Model IEWSD50L95 Brand Name SHIMANO Cable Type E-Tube Model Name Ew-sd50 Unit Count 1.0 Count Item Length 9.5 Inches Item Weight 18.14 g Manufacturer Shimano Connector Type E-tube Number of Pins 2 Number of Items 1 Connector Gender Male-to-Male Compatible Devices Smart Watch Included Components E-Tubes, Cables & Extensions Indoor Outdoor Usage Indoor, Outdoor Warranty Description Limited Warranty Compatible Phone Models No Compatible Phone Models Recommended Uses For Product Connecting components in Shimano's Di2 shifting systems Global Trade Identification Number 00689228828179 Other Special Features of the Product Portable