SHIMANO SM-RT64 brake discs provide powerful and consistent braking performance in all riding conditions. SHIMANO's CENTER LOCK mounting system consisting of a toothed profile and lock washer significantly simplifies the installation and removal of brake discs. CENTER LOCKThe CENTER LOCK system of brake disc with multi-tooth profile and lock washer facilitates installation. This system of mounting by means of a retaining ring enables quick mounting and dismounting of the brake disc, thus saving service costs. In addition, the secure fit on the multi-tooth profile ensures greater precision and strength, increasing the effectiveness of the brake.