Features of the Shimano Dura-Ace BR-R9170 Hydraulic Disc Brake Easy and clean bleeding process One way bleeding More controllable and confidence in race condition Wide pad clearance and chamfer of brake pads Better control and confidence in race conditions Designed as optimum balance of hydraulic brake system for racing purpose Ice Technologies freeza Optimally balanced hydraulic brake system for racing Dedicated brake lever shape, stroke, contact point, stiffness and dedicated shift paddles Simple set up and maintenance Light weight Easy tool access Improved heat dissipation Flat mount system Easy wheel replacement