Specific to SRAM's XX 2x10-speed mountain drivetrain to offer super-fast/smooth shifting and a full range access while in big ring with no chain rub Low-clamp/top-swing (TS), high-clamp/down-swing (DS), or direct-mount (DM) fitment options Clamp options available to fit 31.8/34.9/38.2mm seat tubes (separate shim needed for 28.6mm seat tubes) and designed for 66-69 degree chainstay/seat-tube angles Direct-mount is chainring size/combination specific and available is style: S1 for 42.7mm Dedicated design for top-pull or bottom-pull cable routing Forged alloy clamp/body with a formed steel cage and Torx-T25 hardware: 120g