This shimano deore m615 i spec b compatible brake assembly comes with a fully bled lever and calliper but without adapters or rotors giving you the freedom to customise your bike to suite they can be used with the revolutionary centre lock rotor system which fits easily to centre lock compatible hubs or alternatively conventional 6 bolt rotors can be used all in a choice of 160 mm 180 mm and 203 mm the two piece calliper design is both ridged and durable with opposed 2 piston design reduces