Abstract: The invention relates to a bicycle provided with a gearwheel consisting of a transmission element (3) rigidly connected to a drive shaft (1), a gear rim (4) which comprises an internal toothed gearing and in front of which all other components of a hypocycloidal gearwheel are fixed, a planetary gear (5) which is provided with several gearings and engaged with the gearing of the gear rim (4) by one of the gearings thereof, a sliding member (8) disposed between the plurality of gearwheels (6) and an output shaft (2) and displaceable in the direction thereof between a plurality of positions in each of which one of the gearwheels (6) and said output shaft (2) are rigidly interconnected.

Abstract: A hypocycloidal gear train for transmitting power between two coaxial shafts, one of which is the driving shaft (1) and the other the driven shaft (2), so that the input speed transmitted by the driving shaft (1) is different to the output speed transmitted to the driven shaft (2), and a bicycle having such a hypocycloidal gear train, where the hypocycloidal gear train comprises: a transmission element (3) to be rigidly connected to the driving shaft (1), at least one ring gear (4), having toothing inside and being fixed relative to all of the other components of the hypocycloidal gear train, a planetary gear (5), having several sets of toothing, one of these sets of toothing meshing with the ring gear (4) toothing, the planetary gear being rotatably connected to the transmission element (3) and under the action applied to it by the transmission element during driving shaft (1) rotation, the planetary gear rolls without sliding on the ring gear (4) toothing, so that the tips of its toothing are forced to m