A compact, foldable bicycle, comprising: - a bicycle frame with a front frame part (1, 65, 91, 113, 125), a rear frame part (2, 66, 92, 114, 126) and a folding hinge (3, 67, 93, 115) connecting the front frame part (1, 65, 91, 113, 125) and the rear frame part (2, 66, 92, 114, 126) rotatably to each other, - a head tube (6, 77), - a handlebar, - a steering tube (14, 15) that is connected to the handlebar and, via a folding hinge, to a fork stem, that is mounted rotatably to the head tube (6, 77), - a front wheel (10, 80, 88, 116, 129), - a rear wheel (24, 75, 97, 117, 128), - a bicycle drive for driving the rear wheel (24, 75, 97, 117, 128), comprising a bottom bracket (17, 68, 94, 112, 123, 130), cranks (19, 85, 111, 124) with pedals, that are only connected to the cranks (19, 85, 111, 124) and that can be rotated by 360° around their pedal axle, a driving wheel driven by the cranks (19, 85, 111, 124) and an output wheel coaxial to the rear-wheel axle, the output wheel being driven by the driving wheel either by means of a continuous traction element or by means of an intermediate gear and wherein the distance of the bottom-bracket axle to the rear-wheel axle is larger than half the outer diameter of the rear wheel (24, 75, 97, 117, 128), - a front-wheel fork (78, 87, 136) that is connected to the fork stem, wherein in the folded state of the bicycle, seen laterally, the front wheel (10, 80, 88, 116, 129) and the rear wheel (24, 75, 97, 117, 128) are arranged one behind the other largely congruently and the rear frame part (2, 66, 92, 114, 126), the front frame part (1, 65, 91, 113, 125) and the front-wheel fork (78, 87, 136) form the sides of a triangle, wherein the bicycle is ridden while standing up, that the output wheel of the bicycle drive is arranged on the same side of the bicycle frame as the driving wheel of the bicycle drive and that the steering tube exhibits a lower steering tube and an upper steering tube, that can be displaced linearly relative to each other and that in the folded state of the bicycle are folded-in laterally beside the front wheel (10, 80, 88, 116, 129) and wherein the driving wheel of the bicycle drive is arranged together with a crank (19, 85, 111, 124) on the same side of the bottom bracket (17, 68, 94, 112, 123, 130) characterized in that the average of the outer diameter of the rear wheel (24, 75, 97, 117, 128) and the front wheel (10, 80, 88, 116, 129) amounts to at most 380 mm and the value of the following calculation amounts to at most 1.00: Value = Crank length divided by the wheel base of the bicycle plus horizontal component of the chainstay length divided by the wheel base of the bicycle plus ( crank length multiplied by 5.4 divided by the outer diameter of the rear wheel,. multiplied by the transmission ratio of the bicycle drive, the transmission ratio being the number of revolutions of the crank divided by the number of revolutions of the rear wheel and wherein in the case of multi − speed bicycle drives the transmissions ratio for the hardest sepeed is to be inserted). - a bicycle frame with a front frame part (1, 65, 91, 113, 125), a rear frame part (2, 66, 92, 114, 126) and a folding hinge (3, 67, 93, 115) connecting the front frame part (1, 65, 91, 113, 125) and the rear frame part (2, 66, 92, 114, 126) rotatably to each other, - a head tube (6, 77), - a handlebar, - a steering tube (14, 15) that is connected to the handlebar and, via a folding hinge, to a fork stem, that is mounted rotatably to the head tube (6, 77), - a front wheel (10, 80, 88, 116, 129), - a rear wheel (24, 75, 97, 117, 128), - a bicycle drive for driving the rear wheel (24, 75, 97, 117, 128), comprising a bottom bracket (17, 68, 94, 112, 123, 130), cranks (19, 85, 111, 124) with pedals, that are only connected to the cranks (19, 85, 111, 124) and that can be rotated by 360° around their pedal axle, a driving wheel driven by the cranks (19, 85, 111, 124) and an output wheel coaxial to the rear-wheel axle, the output wheel being driven by the driving wheel either by means of a continuous traction element or by means of an intermediate gear and wherein the distance of the bottom-bracket axle to the rear-wheel axle is larger than half the outer diameter of the rear wheel (24, 75, 97, 117, 128), - a front-wheel fork (78, 87, 136) that is connected to the fork stem,