The Shimano Ultegra R8070 Flat Mount Caliperhydraulc road disc brake offers an ideal balance of light weight and efficient braking, making it the perfect choice for both enthusiast and competitive riders. Shimano Ultegra R8070 Flat Mount Caliper Features Rear wheel use for 140 mm flat mount frames, can be used with adapter for 160 mm Front wheel use for flat mount forks with adapter to flip between 140mm and 160mm 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 Centre-Lock SM-RT800 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 desig