Clarks cmd 15 mechanical disc brake rotorsuitable for use with mtbhybrid bikes the cmd 15 is the most powerful brake in our mechanical range this is due to a large piston surface area and large pad surface area the caliper delivers superb stopping power international post mount compatible front back plate manual adjustment allows for quick easy adjustment to compensate for pad wear and to ensure precision setup includes 1 x caliper 1 x wavy design rotor 6 x t25 torx head rotor bolts