The latest iteration of our industry leading efforts to bring hydraulic performance to the developing road/cross disc market, the HY/RD is an OPEN hydraulic system that is FULLY compatible with ALL existing cable actuated levers! True to our tradition of excellence, the HY/RD brings the following True 'plug-and-play' compatibility with ALL existing cable actuated systems. Hydraulic reservoir provides automatic pad wear adjustment. TRP's own ultra-grippy semi-metallic pad that is Shimano M525/M515 compatible allowing for further customization. Compound works well in dry conditions but may wear quickly in wet/muddy conditions. A mechanically interfacedhydraulic disc brake caliper designed for road levers Hydraulic system self-adjusts for pad wear Self-contained caliper incorporates the master cylinder Cable actuation means compatibility with all mechanical road and CX brake levers Composite pistons isolate heat better than steel, 195g rotor weight not included