Shimano raises the bar with the all-new Ultegra 6800 rear brake caliper. Borrowing technology from its big brother, Dura-Ace 9000, the Ultegra 6800 has been totally redesigned to provide consistently smooth and precise stopping power. Brake modulation is dramatically improved through a dual-pivot design and independent arms that are placed closer to the rim. The shorter arms and dual bearings reduce friction and increase stopping force while providing a much lighter feel at the levers. Race fast with the Shimano Ultegra 6800 rear brake caliper. This is a rear brake only.