Shimano RT66 6-Bolt Disc Brake Rotor SHIMANO's SM-RT66 6-bolt disc brake rotors deliver consistent stopping power in all riding conditions. The disc brake rotor's reliable anti-loosen plate construction makes for quick and secure installation. Larger disc brake rotor options provide consistent brake performance with more power – 220mm disc brake rotor provides 10% more stopping power than 203mm disc. Easy to install anti-loosen plates help secure disc brake rotor bolts in place Resin/Metal pad compatible Includes rotor fixing bolts and non-turn washers Available in Multiple Sizes Main Image for Illustration purposes only