Shimano 105 brake calliper, The racers' choice, 105 brake callipers come in a compact and lightweight design for high performance. Features: Dual-pivot calliper brake with super SLR-EV design for quick linear response, increased rigidity and improved braking power Enhanced brake arch proportions give a quicker linear response and increased power Cartridge brake shoes for easy replacement Compatible with 28c tyres 49 mm drop