Shimano Center Lock 180mm Brake Disc.SHIMANO SM-RT54 brake discs provide exceptional stopping power in all riding conditions. SHIMANO's CENTER LOCK mounting system makes mounting and dismounting of brake discs quick and easy thanks to the groove mount and lock ring design. Shimano Center Lock 180mm Brake Disc.SHIMANO SM-RT54 brake discs offer excellent stopping power in all riding conditions. With the SHIMANO CENTER LOCK attachment system, the brake discs can be mounted quickly and easily thanks to the design of the retaining ring.The CENTER LOCK system of the brake disc with multi-tooth profile and retaining ring facilitates installation. This mounting system by means of a retaining ring allows quick mounting and dismounting of the brake disc and therefore saves service costs.In addition, the secure fit in the multi-tooth profile ensures greater precision and resistance, which increases the effectiveness of the brake.Additional information approximately 10% lighter than SM-RT53