TRP Spyre SLC Caliper Post Mount The Spyre SLC, a mechanical disc brake that offers superior performance with incredibly easy setup. This is a dual piston actuated mechanical disc brake caliper which provides precise clamping force. This translates into even pad and rotor wear because the rotor does not need to flex to one side during braking. We added a simple cable barrel adjuster to make fine tuning easy. Product features Carbon actuation arm for maximum rigidity, and weight savings Dual piston actuation Works with ALL cable actuated road levers Pads: semi-metallic Compatible with Shimano M525/M515 pads Attachment: Postmount Color grey Weight 146g (Manufacturer information)