RaceFace Narrow Wide Chainrings feature tooth profiling for chain retention and a blend of weight and durability suitable for XC, DH and everything in-between.7075-T6 aluminum, aerospace grade strengthCompatible with 9, 10, 11 and 12 speedStiff 4mm plate thickness and I-beam construction transfer loads without flexingReversible laser etched graphicsItem SpecificationsChainring BCD104ColorPurpleDefined ColorPurpleDrivetrain Speeds10Drivetrain Speeds11Drivetrain Speeds12Drivetrain Speeds9MaterialAluminumRing Position/TypeChain Retaining Single RingRound or OvalRoundTooth Count30 RaceFace Narrow Wide Chainring Chainring UPC: 821973329895