Shimano SM-CRM90 Single Chainring For XTR M9000 / 9020 | 34T

Shimano SM-CRM90 Single Chainring for XTR M9000 / 9020Dynamic 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.