An outer rotor construction for a wind turbine generator which outer rotor construction comprises a plurality of rotor housing segments, wherein a rotor housing segment is realized to hold a number of magnet poles, and wherein a rotor housing segment comprises a lateral connecting interface of a lateral connection for detachably connecting that rotor housing segment along its longitudinal length to a number of adjacent rotor housing segments. The invention further describes a wind turbine including a generator, which generator includes an inner stator and such an outer rotor is provided. A method of performing a maintenance procedure on such an outer rotor construction is also provided.