The shimano m447m445 dic brake lever and post mount calliper rear great value fully bled hydraulic disc brake with easily adaptable post style calliper can be used with the revolutionary centre lock rotor system which fits easily to centre lock compatible hubs alternatively conventional 6 bolt rotors can be used all in a choice of 160 mm 180 mm and 203 mm shimano m447m445 dic brake lever and post mount calliper rear features rear fully bled lever and calliper comes without adapters