If youre a rider whose performance needs or riding style dictates that you run a 9-speed drivetrain the pg-950 is the right choice for light weight strength and precise shifting. - speed (cs): 9s - gearing: 11-26t 11-28t 11-32t 11-34t 12-23t 12-26t - cog finish (cassette): silver - technology (cassette): pg - cog sizes: - 11-26t:111314151719212326 - 11-28t:111213141618212428 - 11-32t:111214161821242832 - 11-34t:111315172023263034 - 12-23t:121314151617192123 - 12-26t:121314151718212326