Fsa bb 4000 omega drive mega exo bbfull speed ahead fsa produces world class bicycle components for road cycling mtb and triathlon for world tour teams club riders and people who just love to ride their bikes fsa has a long history in the sport of cycling and a strong heritage of innovation in design and manufacturing oversized cartridge bearings forged steel and cnc machined external cups composite centre sleeve with double o ring seals compatibility omega megaexo weight 200g spi