The Shimano ST-R9180-L Dura-Ace Hydraulic Brake Kit - Left/Rear - Resin w/ Fin brings confident hydraulic braking to sleek time trial and triathlon cockpits, while keeping your hands locked in for consistent control. Designed to complement SHIMANO SYNCHRONIZED SHIFT with intuitive, single-button operation, it also helps you maintain a clean, race-ready setup thanks to integrated cable routing that reduces clutter in the cockpit area.