The invention relates to an arrangement and a corresponding planetary gear for increasing the rotation speed including a sun wheel (12), a gear rim (10), a planet gear (14), a power input shaft (46), and a planet carrier. A construction (40) allowing flexing is placed between the support length (f) of the first fastening end (62) of the shaft (20) of the planet wheel (18) and the closest bearing for dynamically adapting the mesh geometry.