About Avid BB5 Mechanical Disc Brake: The Avid BB5 Mechanical Disc Brakes feature Tri-Align Caliper Positioning System aligns caliper perfectly without shims. Features super-rigid forged body, tool-free pad replacement and 1 inboard pad adjustment knob Integrated cable stop prevents routing cable and housing from entering the brake at odd angles, reducing the possibility of cable drag. Make subtle adjustments to the spring tension using the Allen head set screw Clean-sweep rotor design ensures full brake pad surface is scraped clean for the best performance. 160mm rotor. 333g.