XTR SM-CRM95 race performance chainrings deliver smooth and responsive pedaling over bumpy terrain. The SM-CRM95 chainring features Shimano Dynamic Chain Engagement+ technology, which features unique gear teeth profiles that deliver exceptional chain engagement and chain retention. Details: Model No: SM-CRM95 Series: XTR M9100 Color: Grey/Black Rear Speeds: 12-Speed Gear combination: 30t, 32t, 34t, 36t, 38t Compatibility: The Shimano XTR SM-CRM95 chainrings are compatible with the following: Crankset: Shimano direct mount crank arms: XTR (M9100 series) , XT (M8100 series) , SLX (M7100 series) and Deore (M6100 series)