A multi-speed hub gear, comprising: an axle (101; 201) adapted to be fixed against rotation; a hub shell (102; 203); a plurality of planetary gear sets (109, 115, 116, 117; 206) which are mechanically connected to one another, each comprising a ring gear rotated by at least one rotating gear mounted on at least one rotating gear carrier (113, 121), wherein a respective said ring gear of one of said plurality of gear sets (109, 115, 116, 117; 206) is mechanically connected to a respective said at least one rotating gear carrier (113, 121) of another of said plurality of gear sets (109, 115, 116, 117; 206) such that said plurality of gear sets (109, 115, 116, 117; 206) rotate in conjunction; each of the planetary gear sets (109, 115, 116, 117; 206) having a central gear concentrically fixed on said axle (101; 201) and said rotating gear carrier mounts said at least one rotating gear to revolve around the center of said central gear; and a plurality of lockable bearings, each concentrically mounted between one of said ring gears and said hub shell (102; 203) to engage and disengage at least one of said plurality of gear sets (109, 115, 116, 117; 206) by changing position of at least one of said plurality of lockable bearings between a locked position where a plurality of rollers of said lockable bearing are locked and an unlocked position where said plurality of rollers are not locked and are free to rotate; characterized in that: said plurality of lockable bearings simultaneously disengage a planet carrier of one of said plurality of gear sets (109, 115, 116, 117; 206) and engage a planet carrier of a next one of said plurality of gear sets (109, 115, 116, 117; 206); and in that the multi-speed hub gear further comprises a gear shifter adapted to engage at least one of said plurality of planetary gear sets to said hub shell (102; 203) while disengaging another of said plurality of gear sets (109, 115, 116, 117; 206) from said hub shell (102; 203). an axle (101; 201) adapted to be fixed against rotation; a hub shell (102; 203); a plurality of planetary gear sets (109, 115, 116, 117; 206) which are mechanically connected to one another, each comprising a ring gear rotated by at least one rotating gear mounted on at least one rotating gear carrier (113, 121), wherein a respective said ring gear of one of said plurality of gear sets (109, 115, 116, 117; 206) is mechanically connected to a respective said at least one rotating gear carrier (113, 121) of another of said plurality of gear sets (109, 115, 116, 117; 206) such that said plurality of gear sets (109, 115, 116, 117; 206) rotate in conjunction; each of the planetary gear sets (109, 115, 116, 117; 206) having a central gear concentrically fixed on said axle (101; 201) and said rotating gear carrier mounts said at least one rotating gear to revolve around the center of said central gear; and a plurality of lockable bearings, each concentrically mounted between one of said ring gears and said hub shell (102; 203) to engage and disengage at least one of said plurality of gear sets (109, 115, 116, 117; 206) by changing position of at least one of said plurality of lockable bearings between a locked position where a plurality of rollers of said lockable bearing are locked and an unlocked position where said plurality of rollers are not locked and are free to rotate; characterized in that: said plurality of lockable bearings simultaneously disengage a planet carrier of one of said plurality of gear sets (109, 115, 116, 117; 206) and engage a planet carrier of a next one of said plurality of gear sets (109, 115, 116, 117; 206); and in that the multi-speed hub gear further comprises a gear shifter adapted to engage at least one of said plurality of planetary gear sets to said hub shell (102; 203) while disengaging another of said plurality of gear sets (109, 115, 116, 117; 206) from said hub shell (102; 203). said plurality of lockable bearings simultaneously disengage a planet carrier of one of said plurality of gear sets (109, 115, 116, 117; 206) and engage a planet carrier of a next one of said plurality of gear sets (109, 115, 116, 117; 206); and in that the multi-speed hub gear further comprises a gear shifter adapted to engage at least one of said plurality of planetary gear sets to said hub shell (102; 203) while disengaging another of said plurality of gear sets (109, 115, 116, 117; 206) from said hub shell (102; 203).