SHIMANO SLX RT66 Disc Brake Rotor - 6-Bolt salsapromo 5 1/8" long measuring clamp

5 1/8" long measuring clamp to clamp (127 mm)

They also work with 12 speed SRAM Flattop

50-51mm chainline depending on crankset

X-Horizon straight parallelogram design limits all movement to the horizontal axis

In between these extremes

SHIMANO SLX RT66 Disc Brake Rotor - 6-Bolt salsapromo 5 1/8" long measuring clampSHIMANO'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 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 placeResin Metal pad