SRAM Force Crank Arm AssemblyForm and function. The design of the Force crankarm is a wonder of carbon; light and stiff to effortlessly propel you forward. The 8 bolt interface will fit any SRAM AXS spider or integrated chainring with or without power. The light stiff and durable DUB spindle interface also fits nearly any frame. 8 bolt interface compatible with power and non power AXS spiders and integrated chainrings (Chainring and spider sold separately) DUB bottom bracket adds