Trp spyre mechanical 2 piston disc brake a mechanical brake with power and reliability is not a common creation but the spyre is one of the best mechanical brakes ever produced the added bonus is that this brake is compatible with shimano m525m515 pads which allows for multiple pad compounds to be used featuresdual sided actuation even pad wear includes brake caliper rotor only works with all cable actuated road levers easy adjustment and set up weight 162g per caliper buy trp components