The Hylex RS is a full hydraulic disc brake system for drop bar bikes. It sports an integrated master cylinder in the ergonomically shaped lever body while the drilled out lever blade shaves weight as well as improves grip.. This brake is for single speed aficionados, the rider who wants simplicity without sacrificing braking performance. Using our Hylex Di2 Adapter Kit, this system can be used with a Di2 drivetrain. Flat mount only. FEATURES SPECS FEATURES: Full Open Hydraulic System Ergonomic and perfectly sized hoods create a natural extension from the rider’s hands to the bike Utilizes TRP’s semi-metallic pad compound Compound works well in dry conditions but may wear quicker in wet/muddy conditions Flat mount version compatible with Shimano K02S/K04S pads Rotors, adapters, and flat mount mounting bolts sold separately SPECS: Hydraulic Hose Length: 1900mm Brake Material: Aluminum Caliper mount: Flat mount Lever Blade Material: Aluminum Fluid: Mineral oil Primary Color: Black Disc Diameter: 140 or 160mm (not included)