PowerTrac Elliptical (PTE) Oval Chain Ring Wide Narrow for Shimano GRX Cranks. The unique design creates an oval ring that provides the benefits of a 112 degree dead point after 10% (elliptical ratio) timing. Eliminates rolling down in the "power zone" and allows natural pedaling in the "recovery zone". Wolf Tooth's patented chainring. The wide side of the teeth has maximum contact on the drive side, which disperses the load to extend the life of the chainring. Narrow side allows for mud and debris clearance to reduce friction Alternating wide and narrow tooth patterns to prevent chain from dropping Compatible Chain: 9-10-11spd/12spd SRAM Eagle/KMC/Connex/Wippermann/Campagnolo/ SRAM Flatop AXS Chains Drop-Stop B Weight: 72g Material: 7075-T6 aluminum Chainline: 50mm Compatible with Shimano GRX Crankset including RX600/RX810 Compatible with SRAM Flat Top Chain