Compatible with all 9,10,11-speed chains, 12-speed SRAM Eagle, KMC chains. Not compatible with Shimano 12-speed chainsFeatures:- Special tooth shape a tighter contact with chain and softer pedaling (in comparison with regular chainrings)- Chamfered edges and wide mud gap keeps the ring from getting muddy- Increased tooth height improves chain retention while the bike is shivering and jolting- Overall bicycle weight reduction in the range of 150-400 grams (with no front derailleur and chainguide)- Using highly durable aluminum alloy- Variable teeth thickness prevents chain droppingOval Chainring Advantages:- Even at-the-wheel distribution of pedaling torque- Improved responsiveness and pedaling smoothness, narrower dead spots and increased span of your gluteus and hamstrings- Easier uphill riding, especially on soft and slippery terrains- Increased pedaling efficiencySpecifications:- Chainring shape: Oval- Offset, mm: 38T- Made from: 7075-T651 Aluminum Alloy- Surface coating: Anodizing- Made with: CNC milling- Ovality: 12%- Timing: 108° after TDC (top dead center)- Compatible cranksets: SRAM XX- Weight, grams: 44 (38T)- Chain compatibility: Standard