Shimano Wire EW-SD300More Compact Design If you're setting up your Shimano Di2 drivetrain, then you'll need some wires. The Shimano Wire EW-SD300 is designed for external routing. It is available in multiple lengths from 150 to 1600mm. It is compatible with the E-TUBE system. Features Designed for external routing Available in multiple lengths from 150 to 1600mm Compatible with the E-TUBE system | Shimano | Wire Ew-Sd300 External, 1000Mm, Black