SLX SM-CRM75 stiff and lightweight chainrings deliver smooth pedaling over bumpy terrain. The SM-CRM75 chainring features Shimano Dynamic Chain Engagement+ technology, which features special gear teeth profiles that deliver exceptional chain engagement and chain retention. Details: Model No: SM-CRM75 Series: SLX M7100 Color: Black Rear Speeds: 12-Speed Gear combination: 30t, 32t, 34t Compatibility: SLX M7100 crank arms: FC-M7100, FC-M7120, FC-M7130 Deore XT M8100 crank arms: FC-M8100, FC-M8120, FC-M8130 XTR M9100 crank arms: FC-M9100, FC-M9120, FC-M9125, FC-M9130