SRAM NX Eagle Fat Bike Crankset - 165mm 12-Speed 30t Direct Mount DUB Spindle Interface BLKSRAM NX Eagle Fat Bike Crankset 165mm 12 Speed 30t Direct Mount DUB Spindle Interface Black. The NX Eagle fat bike crankset delivers Eagle styling and performance to the newest addition of the Eagle ecosystem. DUB technology features a better engineered bottom bracket and a new spindle design which together allows for a more uniform approach to bottom bracket fitment better sealing against contamination and forward and backward compatibility. Fat bike