The SRAM CenterLine rotor design provides a smooth, consistent, and quiet running braking surface. Rounded edges make for easier wheel installs and are UCI-compliant. Rounded edges are UCI-compliant and allow for easier wheel installs Compatible with both road and mountain bike brakes 6-bolt hub interface Includes steel rotor bolts If your new rotors are a different size than the ones you&';re replacing, then you&';ll need new brake adapters! Check out our guide to getting the right brake adapters to spend less time on the computer and more on the trails.