The Center Lock rotor system makes it easy to install and swap out brake rotors. This system involves a splined rotor attachment and matching hub. Thanks to the reinforced inner spider ring, rotors are less prone to warp. Tighten the rotor down with a cassette lockring tool and you'll get even torque for a solid rotor attachment. If you decide to run a standard 6-bolt rotor, a lightweight adapter (sold separately) can be easily installed.