We carry Shimano, ROTOR and Wolf Tooth chainrings for Shimano GRX cranksets. This includes both round and oval, as well as 1x and 2x chainrings. These chainrings use a 110/80 4-bolt BCD (the 1x versions use a 110 4-bolt BCD) and are specifically designed for Shimano GRX RX810 and RX600 cranksets. They also fit our 4iiii and power2max GRX power meters. These GRX chainrings are made of anodized aluminum (just like most road rings), which makes them stiff and lightweight.