The TRP HY-RD brake caliper provides the power and modulation of hydraulic disc brakes and is compatible with any cable actuated Shimano and Sram road shift brake lever system, sold as singles - one required for each lever.   Please note: Post mount fitting and rotor sold separately (not included)     Featuring:   Hydraulic reservoir provides automatic pad wear adjustment. Self-contained caliper incorporates master cylinder. Cable actuation means compatibility with all mechanical road and CX brake levers. Includes TRP's own ultra-grippy semi-metallic pad. Compound works well in dry conditions. Composite pistons isolate heat better than steel. Manufacturer recommends use with 160mm rotor.