The Premium 1X Oval 96BCD traction chainring is designed for Shimano XTR M9000 and M9020 cranks Only. They feature exactly same oval shape as rest of absoluteBLACK's oval chainring portfolio. They are not compatible with XT M8000 cranks. Absolute Black Oval M9000 XTR Chainring Features AbsoluteBlack mastered their oval chainrings to perfection, so you can get best possible advantage from the oval/elliptical shape. Finest design to provide excellent weight to strength ratio One of a kind special oval shape (Patent Pending) Greatly improves traction and climbing abilities Unique Patent Pending narrow-wide teeth profiles to keep your chain in place for minimum 12 months! Special 3D teeth machining for ultimate mud relief decrease wear and noise dramatically All rings have built in threads for easy of mounting and reduction in weight Superb quality and great look. You will ride faster using ovals. If you keep using round ring then others will get quicker. You will not feel the oval shape at all Reduces stress on knees