Shimano's lightweight and modern-looking SM-CRE80-12-B chainring features Shimano Dynamic Chain Engagement+ for smoother pedaling and better chain retention over bumpy terrain. Details: Model No: SM-CRE80-12-B Series: STEPS E8000 Series Color: Black Rear Speeds: 12-Speed Gear combination: 34t, 36t 38t Compatibility: Compatible with all Shimano HG 12-speed chains XTR CN-M9100 chain XT CN-M8100 chain SLX CN-M7100 chain Deore CN-M6100 chain