Shimano EW-SD50 E-Tube Di2 Electric Wire The Shimano EW-SD50 E-Tube Di2 electric wire system ensures a clean, customizable, and efficient connection for your Di2 components. Its modular design allows for precise tuning and tidy installation with cables tailored to the specific lengths required for each component. To connect the system, EW-SD50 wires link the junction box—either the SM-JC40 (for external setups) or the SM-JC41 (for internal setups)—to the rear derailleur, front derailleur, battery, and handlebar-mounted battery indicator junction box. Available in various pre-cut lengths, these cables eliminate the need for cutting, offering a professional and seamless installation experience. Features: Multiple pre-cut lengths for a clean, customized fit Compatible with front and rear derailleurs Genuine Shimano spare part Ideal for precise and efficient Di2 system setups Genuine, brand new, boxed Shimano product - Biketart are an official UK Shimano stockist.