Key Features:Good value 57 mm drop rear calliper brakeSuper SLR dual pivot design keeps operating friction to a minimum, improving braking performanceMust be used in conjunction with ST-4600, ST-4603, ST-5700, ST-5703, ST-6700 or ST-7900 STIs for correct leverage ratioEnhanced brake arch proportions give a quicker linear response and increased power57 mm dropLightweight aluminium calliper design with tough anodised finishToe-in adjustable brake shoes for perfect pad alignmentDurable quick release for fast and easy wheel removalComes with 10.5 mm sunken nut.