Your time on the bike is precious let Shimano make it even better. Ultegra ST-R8170 brake levers bring enhanced modulation and control to every ride by employing Shimano s proven SERVO-WAVE technology. The Di2 platform untethers the shifters while delivering fast and reliable wireless shifting. BR-R8170 disc brake caliper brings a new level of control to the road cycling world with improved modulation and a quicker initial braking point. Despite its smaller construction the system is quieter than ever and easier to maintain.Features-The wireless connection provides a clean cockpit enhancing the aerodynamic effect and easy maintenance-Wider pad clearance decreases brake noise-Maintenance-friendly bleeding process-Unparalelled ergonomic features such as raised hood peaks on levers-Brake control is optimized with light and smooth lever action-Enhanced modulation thanks to an expanded braking control area-Compatible with wireless or wired connection