Shimano R55C4 Brake Shoes / Pads for Carbon Rims (2 Pairs) Optimize your road bike’s stopping performance with genuine Shimano R55C4 brake pads, engineered specifically for high-end carbon wheelsets. Whether you are running premium Dura-Ace, Ultegra, or 105 groupsets, these cartridge-type insert pads offer the perfect balance of explosive brakin..