Compatibility: [road bike drivetrains] Shimano Ultegra R8100 and Dura-Ace R9200, [e-bike] Shimano EP800 drive units Activity: road cycling, e-bike Manufacturer Warranty: 2 years With the release of Shimano's updated Dura-Ace and Ultegra 12-speed Di2 drivetrains comes a new e-tube wire that's based on technology developed for Shimano's industry-leading e-bike systems. The SD300 wire is more compact and lightweight than previous e-tube wires, and it comes in a wide variety of lengths so you can connect your derailleurs to the Di2 battery regardless of frame size or shape.