Pronounced "High Road"...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! Convert any Road/Cross cable lever to a powerful hydraulic disc brake system True &';plug-and-play&'; compatibility with ALL existing cable actuated brake lever systems TRP&';s own ultra-grippy semi-metallic pad that is Shimano compatible allowing for further customization Heat dissipating composite pistons self-adjust for pad wear Adjustable cable-leverage to optimize performance with different levers Kit includes integrated caliper/master cylinder unit (rotor and adapter sold separately) Kit: each, front or rear Caliper: flat mount Rotor: sold separately