Trp Spyke, Mtb Mechanical Disc Brake, Front Or Rear, Post Mount, Disc: Not Included, 170G, Black* Dual piston actuation* Even pad wear* Easy adjustment and set up with integrated barrel adjuster* Works with ALL long pull levers* TRPs own ultra grippy semi metallic pad that is Shimano M525 M515 compatible allowing for further customization* Caliper and mounting bolts included * Rotor and adapters sold separately* Weight: 170g caliper per wheel