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 graphics30t Narrow-Wide single rings are threaded with a standard M8 x 0.75 chainring bolt threadColor: BlackMaterial: AluminumTooth Count: 30Ring Position/Type: Chain Retaining Single RingDrivetrain Speeds: 9 , 10 , 11Defined Color: BlackChainring BCD: 104Model: Narrow Wide