The Shimano Ultegra BR-R8170 Flat Mount Brake Caliper without Rotor/Adapter is a hydraulic road disc brake caliper offering an ideal balance of lightweight and efficient braking, making it the perfect choice for both enthusiast and competitive riders.Shimano Ultegra BR-R8170 Flat Mount Brake Caliper without Rotor/Adapter FeaturesFront-wheel use for flat-mount forks with an adapter to flip between 140 and 160 mmOversized 22mm ceramic pistons optimized for heat insulation, lightweight and stiffnessOpposed 2-piston design reduces leading effect and optimal pad wear increases braking controlIncreased pad to rotor clearance reduces the chance of rotor dragDirect flat mount and open design allows easy and quick wheel replacementForged calliper design is lightweight and rigidOne way internal fluid circuit makes bleeding easyMineral oil brake fluid is non-corrosive and less hazardous than conventional hydraulic brake fluidShim-less mounting bracket allows for quick installation and setting upRecommended for use with Ice Tech FREEZA Center Lock SM-MT800 rotors for optimum braking performanceComes complete with resin compound aluminium radiation fin pad further improves heat dissipation reducing brake surface temperature by 50 deg CInline hose routing for low profile designSeparate bleed port and valve screw for improved bleeding process