The Shimano Dura-Ace BR-R9210-RS Seatstay Direct Mount Rear Brake Calliper is a top of the range, SLR-EV dual symmetric pivot direct mount calliper brake with a quick linear response, increased rigidity and improved braking power.Shimano Dura-Ace BR-R9210-RS Seatstay Direct Mount Rear Brake Calliper FeaturesDirect calliper twin bolt mounting has an 11mm lower profile design improving aerodynamicsRear mount, designed to mount on the seatstaysEnhanced brake arch proportions give a quicker linear response and increased powerBetter clearance with wider tyres, compatible with 28C tyre sizeTitanium centre pivot bolt for light weightThrust bearings and coated bushings between arms for smooth linear feel and increased durabilityBrake pad compound offers excellent stopping power under wet and dry conditions, with improved durabilitySpring tension adjuster for precision setupAdjustable toe-in on the brake shoes for easy setting up