Carbon or alloy backplate single ring guide. Tracked and grooved upper guide / backplate interface increases stiffness and eases installation. Co-molded “HD2” upper guide with softer durometer interior for silent guidance. Integrated skid protects chainrings and glides over rocks and obstacles. Oval compatible. Change between the sealed bearing pulley or the optional G-Slider block (included) for muddy conditions. Compatible with 7-12sp drivetrains