E-Tube E-Tube is a system platform for the Di2 concept (Digital Integrated Intelligence). E-Tube transmits interactive signals and supplies all electronic parts with power via "Plug & Play" connections. E-Tube is resistant to corrosion, expansion and frost and guarantees low maintenance. It offers optimal flexibility for your bike. With E-Tube Project you can customise the settings of electronic components and update the firmware via Windows PC or Tablet or Smartphone. It provides quick and easy access to information on electronic components and provides an immediate overview of the system status.