TRP Spyre-SLC 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 Carbon fiber actuation arm and forged aluminum caliper body Kit includes twin piston 74mm caliper with barrel adjuster (rotor and adapter sold separately) Specifications: Brake Type: Mechanical Disc Brake Lever Pull: Short Pull Brake Mount: Post Mount Brake Pads: Semi-Metallic Barrel Adjuster: Yes Rotor Included: No Color: Black/Grey Weight: 146g