Mega-9: Wide range 9-speed gearing with close ratio intervals provides improved cadence control, a great advantage in cross-country racing. HG Design: 9-speed specific HG sprockets for fast and positive shifting response. Light Alloy Sprocket Carrier: Sprockets are drilled out for lightness and mounted through a light alloy carrier that increases rigidity while reducing weight. Titanium Construction: The four largest sprockets are titanium for reduced weight without sacrificing strength. Specifications Alloy Sprocket Carrier yes Number of Sprockets 9-Speed HG Group Identification ap Sprocket titanium (23,26,30,34T) Steel (12,14,16,18,20T) Sprocket Finish Ti/Ni-P coated Chain Compatibility Super Narrow HG Weight 262g