TRP Spyke Mechanical Post-Mount Caliper for long-pull levers, without rotor, BlackSpyke mechanical disc brake calipers are designed for off road use. The dual sided mechanical caliper actuates the pads to provide even and precise clamping force for superior stopping power. This results in even pad wear and easy pad adjustment with the addition of a barrel adjuster. Two piston movement evenly contacts rotors for optimum braking power and modulation Ramped ball bearings for smooth pad engagement and improved modulation Alloy