The Shimano Dura Ace 9110 Rear Brake Calliper Seatstay Direct Mountis a top of the rangeSLR-EVdual symmetric pivot seatstay mounted calliperbrake with quick linear response. Shimano Dura Ace 9110 Rear Brake Calliper Seatstay Direct MountFeatures Top of the range SLR-EV dual symmetric pivot direct mount calliper brake with quick linear response, increased rigidity, and improved braking power Direct calliper twin bolt mounting has 11 mm lower profile design improving aerodynamics Rear mount, designed to mount on the seatstays Enhanced brake arch proportions give a quicker linear response and increased power Better clearance with wider tyres, compatible with 28C tyre size Titanium centre pivot bolt for light weight Thrust bearings and coated bushings between arms for smooth linear feel and increased durability Brake pad compound offers excellent stopping power under wet and dry conditions, with improved durability Spring tension adjuster for precision setup Adjustable toe-in on the brake shoes for easy setting up