Shimano believes in offering the highest possible quality for every level of its components. And since the Shimano 105 5800 Brake calipers have received a face lift worthy of their Dura-Ace big brother, it’s important that the Shimano 105 5800 Brake Pads get the same treatment. The 105 5800 brake pads, which are also referred to as R55C4, have been made from a proprietary compound that is designed to give you the greatest possible control when stopping your aluminum-rimmed wheels.