Shimano XTR M9100/M9120 Single Chainring - 12 Speed - Dark Grey / 38 / Direct Mount / 12 Speed

Dynamic Chain Engagement (DCE) is used to hold the chain and help prevent chain jump out. This is achieved by using a broader and taller tooth profile in conjunction with a special hooked leading edge and alternate profiled tooth shaping. This provides superior chain retention, lower driving sound, increased durability and drag to a minimum. Hollow gear construction for optimized rigidity, lightweight and durability. Durable teeth using a Stainless steel construction supported by a carbon and alloy carrier body on 38T/36T/34T. 12-speed chain compatible. Available in 34T/36T/38T.