To the delight of riders and mechanics alike, the new Shimano Ultegra BR-R8170 caliper delivers enhanced modulation, a quieter brake system and an easier than ever bleed process. The Ultegra R8170 disc brake caliper brings a new level of control to the road cycling world with enhanced modulation and a quicker initial braking point. Despite its smaller construction, the system is quieter than ever and easier to maintain.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 ridersFront wheel use for flat mount forks with 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 calli