Abstract: A bicycle frame including a front portion configured to receive a front wheel assembly; a rear portion configured to receive a rear wheel assembly; and a connecting member connected to the front portion at a first connecting point and connected to the rear portion at a second connecting point, the first and second connecting points being spaced from one another along the length of the connecting member; wherein one of the front and rear portions extends towards and is connected to the other of the front and rear portions at a third connecting point to form a link; wherein the frame is configured so as to allow a distance between at least two of the connecting points to be adjusted; wherein adjustment of said distance increases or decreases the size of the frame.