Shimano XTR M9000 Race Brake LeverCaliper Disc Brake. If you're interested in shaving every gram and having the highest quality, high performance goodies for your feather light cross country rig, the first and last name in the game is Shimano XTR. And guess what, the engineering gurus at Shimano just made the groupset better, including the brake levers and disc brakes. With race tuned power and an overall lighter weight, the new Shimano XTR M9000 Race hydraulic brake lever and disc brake are designed to win championships for pro cross country riders. It's all about weight reduction as there's a magnesium caliper and master cylinder, a carbon fiber brake lever blade, as well as titanium mounting bolts. Ice Technology radiator pads and a new glass fiber phenolic construction piston provide the ultimate in heat control so you can torch the competition and not your brakes.