the racers' Choice, 105 brake callipers come in a compact and lightweight Design For high performance low profile aerodynamic direct mount super slr-ev dual-pivot design provides superior brake performance and light action can be used on frames with seat stay direct mounts enhanced brake arch proportions give a quicker linear response and increased power low profile outer cable stop position improves cable routing for reduced friction cartridge brake shoes for easy replacement convex washers on the brake shoes offer toe-in brake adjustment and easy alignment lightweight aluminium construction, with an anodized finish to preserve the good looks compatible with 28C tyres 49 mm drop .