TheSRAM Rival 1 Hydrualic Disc Brake platform provides better speed modulation and braking performance in all conditions. Pair with a Rival 11-Speed shifter for 1x set-up. HydroR brake lever features and all new design, with revised ergonomics for better finger wrap. Enjoy seemingly effortless braking regardless of terrain or condition.Left rear brake (1800mm) with direct mount hardware (rotor & bracket sold separately). Lever ErgoDynamic design for better finger wrap Revamped design Individual reach adjust Front and rear brake may be converted on the grips Lower hand forces required Fully sealed system Easy bleed access Open system hydraulic Caliper Forged aluminum disc caliper with stainless steel backed pads and hardware Optimized power & modulation for road & cyclocross 18 mm piston Fully sealed system Road specific caliper and piston ratio