The shimano ultegra r8070 flat mount caliper hydraulc road disc brake offers an ideal balance of light weight and efficient braking making it the perfect choice for both enthusiast and competitive riders shimano ultegra r8070 flat mount caliper features rear wheel use for 140 mm flat mount frames can be used with adapter for 160 mm front wheel use for flat mount forks with adapter to flip between 140mm and 160mm oversized 22mm ceramic pistons optimized for heat insulation lightwei