Get a powerful, yet light action at the lever. Avid Mechanical brakes set a new standard for cable operated systems. Features include: Caliper Positioning System allows the caliper to easily adjust perfectly to the rotor - no trial and error. Simple micro-adjust spring tension is achieved with an Allen head set screw. Special rotor design to ensure full brake pad is scraped clean at all times. Fully sealed to keep elements out and performance in. Tool-less pad replacement and adjustment. This is a great upgrade to your mechanical disc equipped recumbent or trike.