Now with more efficiency and 10% more power, the Shimano 105 BR-5800 Caliper Brake Set features a new symmetrical dual-pivot caliper design with twin bearings at the pivots for smoother operation. These brakes offer the same remarkable stopping performance found on the Ultegra and Dura-Ace. Taller arch clears higher volume 28mm tires for more versatility. Compact and lightweight construction improves aerodynamics.