The new Shimano Ultegra BR-R8170 caliper brings unparalleled joy to riders and mechanics alike. It offers superior modulation, a whisper-quiet brake system, and the simplest bleed process to date. With the Ultegra R8170 disc brake caliper, road cyclists can now experience a heightened level of control and a quicker response from the brakes. Its compact design not only enhances performance but also ensures a quieter operation and effortless maintenance. Features: Ultegra hydraulic road disc brake offer an ideal balance of light weight and efficient braking, making it the perfect choice for both enthusiast and competitive riders Front wheel use for flat mount forks with adapter to flip between 140 and 160 mm Oversized 22mm ceramic pistons optimized for heat insulation, lightweight and stiffness Opposed 2-piston design reduces leading effect and optimal pad wear increases braking control Increased pad to rotor clearance reduces the chance of rotor drag Direct flat mount and open design allows easy and quick wheel replacement Forged calliper design is lightweight and rigid One way Internal fluid circuit makes bleeding easy Mineral oil brake fluid is non-corrosive and less hazardous than conventional hydraulic brake fluid Shim-less mounting bracket allows for quick installation and setting up Recommended for use with Ice Tech FREEZA Center Lock SM-MT800 rotors for optimum braking performance Comes complete with resin compound aluminium radiation fin pad further improves heat dissipation reducing brake surface temperature by 50 deg C Inline hose routing for low profile design Separate bleed port and valve screw for improved bleeding process