Shimano part numbers: 42T - Y0R79804T, 40T - Y0R79803T, 32T - Y0R79802T, 30T - Y0R79801T. CUES 6000 series chainrings are only compatible with CUES componentry. The chainring is manufactured from steel and has a 4 bolt mounting pattern to the crank arm increasing stiffness and durability.
