SHIMANOs SM-RT66 6-bolt disc brake rotors deliver consistent stopping power in all riding conditions. The disc brake rotors reliable anti-loosen plate construction makes for quick & secure installation. FEATURES Larger disc brake rotor option provides consistent brake performance with more power 220 mm disc brake rotor provides 10% more stopping power than 203 mm Easy to install anti-loosen plates help secure disc brake rotor bolts in place Resin/ Metal pad compatible PRODUCT SPECIFICATIONS MODEL NO SM-RT66 SERIES ABS AU300 Series Remarks With anti loosen tightening plate 6-bolt (P.C.D. 44 mm) &10004; Outside diameter_160 mm &10004; Outside diameter_180 mm &10004; Outside diameter_203 mm &10004; Pad material compatibility_ Metal &10004; Pad material compatibility_ Resin &10004; Outside diameter (mm)_220 &10004; Pad lining shape compatibility_ Narrow &10004;