Shimano Deore XT SM CRM80 Single Chainring. The ability to run a dedicated 1x11 speed drivetrain is one of the noteworthy options in Shimano's new Deore XT M8000 groupset, and these Deore XT SM CRM80 single chainrings are exactly what you need to make that happen. When paired with Shimano Deore XT M8000 crank arms item SH M8000S, sold separately, you'll be running the most advanced XT crankset to date having drawn inspiration from Shimano's flagship XTR groupset. Featuring Shimano's Dynamic Chain Engagement technology, the dedicated 1x chainrings feature tooth profiles that are taller and squarer to ensure chain retention on any trail conditions. Constructed of stainless steel and carbon fiber, they're optimized for both light weight and durability and are available in three sizes 30T, 32T, and 34T so you can dial in the gear ratios to best meet the demands of your favorite trails.