Avid bb5 mechanical disc brakeentry level schmentry level the bb5 offers the avid tri align caliper positioning system tool free pad replacement a melt forged body and an inboard pad adjustment knob one try and youll wonder if the bb5s are really entry level brakes features tri align caliper positioning system another original avid technology making your life bettertheres never been an easier brake to install and adjust with avids tri aligncaliper positioning system aligning the