Finally a mechanical disc brake for mountain bikes and fat bikes that offers superior performance and is a snap to set up. The TRP Spyke is a dual sided mechanical caliper where both pads actuate providing even and precise clamping force. This results in even pad wear and easy pad adjustment with the addition of a barrel adjuster. No longer is adjusting the whole caliper necessary as the pads wear. All of this in a 169g (per caliper) package that works with all linear pull levers. FEATURES SPECS FEATURES: Dual piston actuation Even pad wear Easy adjustment and set up with integrated barrel adjuster Works with ALL long pull levers TRP’s 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 SPECS: Brake Material: Aluminum Caliper mount: Post mount Position: Front or Rear Primary Color: Black Approximate Brake Weight: 170g Disc Diameter: Not included