A power transmission system for a wind turbine, comprising: a gearbox having a gearbox housing and a gearbox output member extending from the gearbox housing; and a generator including: a generator housing coupled to the gearbox housing; a stator supported by the generator housing; a rotor positioned within the generator housing, the rotor having a rotor shaft coupled to the gearbox output member so as to be driven thereby and a rotor body supported by the rotor shaft, at least a portion of the rotor shaft extending in an axial direction, wherein the rotor is rotatable within the generator housing and effectively divides the generator housing into a drive-end side and non-drive-end side, the drive-end side being coupled to the gearbox housing, the stator being supported between the drive-end and non-drive-end sides; a non-drive-end shield coupled to the non-drive-end side of the generator housing; a spindle extending from the non-drive-end shield in the axial direction, the spindle being integrally formed with or secured to the non-drive-end shield; and at least one generator bearing positioned between the rotor shaft and spindle, wherein the at least one generator bearing supports the gearbox output member and rotor shaft. a gearbox having a gearbox housing and a gearbox output member extending from the gearbox housing; and a generator including: a generator housing coupled to the gearbox housing; a stator supported by the generator housing; a rotor positioned within the generator housing, the rotor having a rotor shaft coupled to the gearbox output member so as to be driven thereby and a rotor body supported by the rotor shaft, at least a portion of the rotor shaft extending in an axial direction, wherein the rotor is rotatable within the generator housing and effectively divides the generator housing into a drive-end side and non-drive-end side, the drive-end side being coupled to the gearbox housing, the stator being supported between the drive-end and non-drive-end sides; a non-drive-end shield coupled to the non-drive-end side of the generator housing; a spindle extending from the non-drive-end shield in the axial direction, the spindle being integrally formed with or secured to the non-drive-end shield; and at least one generator bearing positioned between the rotor shaft and spindle, wherein the at least one generator bearing supports the gearbox output member and rotor shaft. a generator housing coupled to the gearbox housing; a stator supported by the generator housing; a rotor positioned within the generator housing, the rotor having a rotor shaft coupled to the gearbox output member so as to be driven thereby and a rotor body supported by the rotor shaft, at least a portion of the rotor shaft extending in an axial direction, wherein the rotor is rotatable within the generator housing and effectively divides the generator housing into a drive-end side and non-drive-end side, the drive-end side being coupled to the gearbox housing, the stator being supported between the drive-end and non-drive-end sides; a non-drive-end shield coupled to the non-drive-end side of the generator housing; a spindle extending from the non-drive-end shield in the axial direction, the spindle being integrally formed with or secured to the non-drive-end shield; and at least one generator bearing positioned between the rotor shaft and spindle, wherein the at least one generator bearing supports the gearbox output member and rotor shaft.