Shimano's new XTR, XT, and SLX 12-speed Hyperglide chains operate differently than traditional designs and thus require a special chainring to work properly. Being the problem solvers that they are, Wolf Tooth's engineers took the time to understand how the system works and designed a completely new tooth profile that provides optimal chain retention and durability with this new system. The Shimano 12-Speed Direct-Mount Chainring is made specifically for Shimano XTR M9100 series cranks, providing riders with the quiet and smooth performance of the HG drivetrain combined with the legendary chain retention of Wolf Tooth chainrings.