The electronic Dura Ace group with Di2 technology complements the mechanical Dura Ace 9000 group. The Dura Ace 9100 electronic group is based on the latest technologies that offer the rider a revolutionary riding experience. After development work by hundreds of engineers and extensive testing on the World Tour, the Dura Ace with Di2 is now available - and has caused a sensation in the cycling world.E-TubeThe E-Tube platform offers optimal flexibility. E-Tube transmits interactive signals and supplies power to all parts via "Plug & Play" connectors. E-Tube is resistant to corrosion, expansion and frost and guarantees low maintenance. Furthermore, SM-PCE1 establishes the connection between PC and components to update the firmware. Updating the firmware keeps digital devices up to date and provides better functionality.