Shimano Disc Brake Rotor 6-bolt 203mm. The Shimano SM-RT66 6-bolt disc brake rotor deliver consistent stopping power in all riding conditions.. The disc brake rotor's reliable anti-loosen plate construction makes for quick and secure installation.. Specifications. • Model: SM-RT66. • Fitting: 6-bolt. • Design Feature: Anti loosen tightening plate. • Brand: Shimano. • Size: 203mm.
