Model Numbers: FC-M6100-1, FC-M6120-1, FC-M6130-1 Series: Deore M6100 Chainring Sizes: 30t, 32t Included: Crank fixing bolt Gear Arms: 4 Chainring Mount: Direct Speeds: 12 Included: Chainring The Shimano Deore 12-speed crank boasts a novel design, employing direct mount chainrings and a distinctive gear tooth profile to enhance chain retention. This Deore crankset is offered in the M6100, M6120, and M6130 models.