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- 7075-T6 aluminum ring with tall, narrow-wide tooth design to prevent chain drop\n- Precision CNC machined and hard anodized surface coating for longevity\n- Computer-aided design enables the ultimate combination of strength and lightness\n- 104BCDx30t model has threaded mounting bosses for crank tab clearance\n- 96BCD pattern fits Shimano XTR (M9000) and Shimano XT (M8000) cranks\n- Compatible with 9-12 speed chains, allowing a 1X set up on most any drivetrain