SRAM brake disc Centerline XR two-part Rounded Edges 160 mm | Centerlock New, optimized design with a large friction surface for more braking power and less braking fading. The redesigned aluminum spider ensures better heat dissipation and better aerodynamic properties. Due to the 7-point mount the friction ring, the vibrations of the disc could be reduced, which also reduces noise when braking. The rounded edges on the top of the pane minimize the risk of injury and comply with the guidelines of the World Cycling Association UCI. Another advantage is that they make it easier to install the impeller because the rounded top prevents jamming in the brake caliper.