TRP Spyre Disc Brake. Features: Convert any Road/Cross cable lever to a powerful mechanical disc brake system Two opposing pistons engage the rotor evenly from both sides Aluminum actuation arm and forged aluminum caliper body Resin with Metal Fibers pads are compatible with Resin-Only type rotors as well as standard rotors Kit includes twin piston caliper with barrel adjuster (rotor and adapter sold separately) Specifications: Brake Type: Mechanical Disc Brake Lever Pull: Short Pull Brake Mount: Flat Mount Brake Pads: Semi-Metallic Barrel Adjuster: Yes Rotor Included: No Color: Black/Silver Weight: 154g