The mavic hg11 fts freehub body is compatible with shimano or sram drivetrains as well as 891011 speed cassettes keep in mind that for 8910 speed cassettes you will need a spacer that is sold separately composed of steel for greater impact resistance weighs only 98gdetails compatible shimano or sram drivetrains fits 891011 speed cassettes 8910 speed cassettes will require spacers material steel weight 98g manufacturer part number m40592