The Shimano Dura-Ace BR-R9270 Flat Mount Calliper is a top of the range, high performance Dura-Ace low profile hydraulic road disc brake calliper, providing efficient braking in all conditions.Shimano Dura-Ace BR-R9270 Flat Mount Calliper FeaturesFront wheel use for flat mount forks with adapter to flip between 140 and 160mmOversized 22mm ceramic pistons optimized for heat insulation, lightweight and stiffnessOpposed 2-piston design reduces leading effect and optimal pad wearImproved pad to rotor clearance with a 10% increase pad clearance over BR-B9170, 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-MT900 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