The Hope 104BCD Retainer Chainring has a narrow/wide tooth configuration designed for 1x10 1x11 1x12 drivetrains including SRAM T-Type and Shimano HG+ set-ups without the need for a chain guide. Designed to be compatible with 9 10 11 and 12-Speed drivetrains including SRAM T-Type and Shimano HG+ Improved mud shedding capability and chain retention Better performance with extreme chain angles on modern 1x drivetrains Leg design provides improved strength and stiffness CNC machined 7075-T6 aluminum provides the perfect blend of lightweight and strength Quieter drivetrain and reduced drag