SRAM Rival X-Sync Chainring SRAM X-Sync chainrings feature tall teeth with alternating tooth profiles that hold the chain amazingly well and still provide space for mud to clear. Features Full CNC AL rings SPECIFICATIONSTooth Count42Ring Position/Type Chain Retaining Single Ring Drivetrain Speeds11 , 10Chainring BCD110MFG#11. 6218. 019. 004 | Sram | Rival X-Sync Chainring 42T 110Mm Bcd | Aluminum