There are three calipers in total one specific front fork mount and two rear mounts, one designed for the seatstays and the other as rear chainstays under Bottom bracket Mount Calliper.
Shimano Dura Ace R9110 Direct Mount Brake Caliper Features
- 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