Shimano SM-CRM81 Single Chainring XT M8000The Shimano SM-CRM81 Single Chainring XT M8000 is a dedicated 1x11-Speed chainring specifically for the Shimano XT M8000 crankset. Smooth Drivetrain PerformanceThis XT chainring features Dynamic Chain Engagement technology, which uses a unique tooth profile that provides superior chain retention, drivetrain smoothness and less chain noise. This updated version of the XT chainring includes a narrow-wide tooth profile for even better chain engagement and makes it the perfect chainring to suit any rider, in any condition.Features:Material: Plated Steel (teeth)Compatible Chain: Dyna-Sys HG-X11 11-SpeedDrivetrain: 1 x 11-SpeedUse: MTBWeight: 90gTechnologies:Dynamic Chain Engagement: This technology effectively holds the chain and prevents chain drop. This is achieved by using a broader and taller tooth profile in conjunction with a special hooked leading edge. This all aids drivetrain performance on uneven terrain, keeps chain noise low, drag to a minimum and increases chain and chainring durability.Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.