PowerTracElliptical (PTE) Oval Chainring Wide/Narrow for SRAM 8 Bolt Crank. Its unique design makes it an oval ring that provides the benefits of a 112 degree dead point after 10% (elliptical ratio) timing. Eliminates rolling down in "power zone" and allows natural pedaling in "recovery zone". WolfTooth'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 Chains: 9-10-11spd or 12spd SRAMEagle, SRAMFlattop, Campagnolo, KMC, Connex, or Wippermann Chain Drop-StopB (as pictured) Weight: 4.6 oz Material: 7075-T6aluminum Compatibility: SRAM/QUARQ Crank Chain Line with 8 Bolt Mount: 45mm