TRP Spyre-SLC Post Mount Caliper - GreyDescription The TRP Spyre SLC sets the benchmark for mechanical disc braking performance. Designed for riders who prefer the simplicity of cable actuated systems without sacrificing modulation or power, it features dual piston actuation that moves both pads evenly against the rotor for consistent braking control. The carbon fiber actuation arm reduces weight while improving stiffness and feel, and hybrid pistons help isolate heat to maintain braking