The Spyre is a dual sided mechanical caliper where both pads actuate providing even and precise clamping force With a built in barrel adjustor and easy pad adjustment installation and service is quick and hassle free Works with ALL cable actuated road levers - Compressionless housing highly recommended Compatible with Shimano M525/M515 pads as well as TRP Intended for frames compatible with flat mount brake systems Frt or Rr No Rotor Black Mechanical Flat MountUPC/EAN/GTIN: 4717592021981