The super SLR dual pivot design of the Shimano R451 road bike brake keeps operating friction to a minimum, improving braking performance. The 57mm drop is measured from the central mounting bolt to a virtual point between the pads, which aligns with the centre of the pad at its lowest point. Features: - Good value 57 mm drop caliper brake - Super SLR dual pivot design keeps operating friction to a minimum, improving braking performance - Must be used in conjunction with ST-4600, ST-4603, ST-5700, ST-5703, ST-6700 or ST-7900 STIs for correct leverage ratio - Enhanced brake arch proportions give a quicker linear response and increased power - Lightweight aluminium caliper design with tough anodised finish - Toe-in adjustable brake shoes for perfect pad alignment - Durable quick release for fast and easy wheel removal - Comes with 10.5 / 12.5 / 18 / and 27 mm sunken nut depending on option selected - 32mm max tyre size