Series of planetary gearboxes, wind turbine, industrial application, and use of rolling bearings

A series of planetary gearboxes, comprising

• a first plurality of subseries of planetary gearboxes including
• a planetary gear carrier of a planetary stage, at least two rolling bearings, and a planetary gear mounted on the at least two rolling bearings, said at least two rolling bearings in a first one of the first plurality of subseries having a first bearing width and in a second one of the first plurality of subseries having a second bearing width, and
• a spacer element arranged between the at least two rolling bearings and configured to adjust a total bearing width of the at least two rolling bearings, wherein the spacer element has an axial length which corresponds to 0.1 to 0.2 times the first bearing width.