Abstract: A bicycle with a drive on a front wheel, which after the handlebar is turned relative to the front wheel frame, has reduced overall dimensions and can be easily adjusted to be ridden by two persons. The bicycle frame includes the front wheel frame and the rear wheel frame coupled together by a joint and a crossed line transmission, with a fixed seat and back-rest. The axis of the joint intersects the floor at a point spaced behind the point of contact of the front wheel with the floor. The handlebar is mounted rotationally in a swivel axle of the front wheel frame. The small wheel of the transmission is immovably fixed to the rear wheel frame in the axis of the joint, and the big wheel of the transmission is immovably joined through the swivel axle with the handlebar and rotates about the axis of the swivel axle.

Abstract: A bicycle with a drive on a front wheel, which after the handlebar is turned relative to the front wheel frame, has reduced overall dimensions and can be easily adjusted to be ridden by two persons. The bicycle frame includes the front wheel frame and the rear wheel frame coupled together by a joint and a crossed line transmission, with a fixed seat and back-rest. The axis of the joint intersects the floor at a point spaced behind the point of contact of the front wheel with the floor. The handlebar is mounted rotationally in a swivel axle of the front wheel frame. The small wheel of the transmission is immovably fixed to the rear wheel frame in the axis of the joint, and the big wheel of the transmission is immovably joined through the swivel axle with the handlebar and rotates about the axis of the swivel axle.

Abstract: The subject of the invention is a bicycle with a drive on front wheel, which after turning the handlebar by cca 110° relative to the frame of the front wheel considerably reduces its overall dimensions and which can be easily adjusted tor two persons. In this bicycle the train e consists of the frame (1) of the front wheel (15) and the frame (2) of the rear wheel (16), with the seat (19) and a back-rest (14) fixed. Both frames are coupled with the joint (3) and the crossed line transmission (10, 11, 12). In this coupling the axis of the joint (3) which is a part common to both frames intersects the floor surface in the point (C) at an angle of 69°±3°, at a distance of 20±4 cm behind the point of contact of the front wheel with the floor. Applied drive system (18) is placed preferably on the axis of driven wheel, and it consists of the crank system (17), planetary transmission and the one-way clutch.