Shimano dura ace r9170 road disc brake calipershimano dura ace is now offered with road specific disc brakes that have been tuned to perform optimally in road racing conditions the r9170 calipers feature the shimano flat mount system for a sleek and aerodynamic profile and ice tech pads for improved heat dissipation they are easy to set up and maintain thanks to their easy bleed system that uses one way bleeding features optimally balanced hydraulic brake system for racing light weight impro