The SRAM RED AXS road brake caliper has been designed with features to make the brake body more aerodynamic helping to keep speed until you're ready to slow down.AeroLink arm amplifies braking power while reducing frontal area Aero design extends to the shape of the indexed four-position quick release Lighter aero pad retainers carry SwissStop Flash Pro pads standard Wider clearance for modern tires and wheelsets (up to 28c)