Fuente: WIPO "biotechnology" The present invention relates to an improved motorcycle structure, comprising a front wheel, a back wheel, an engine, and a frame body; wherein the frame body having a left horizontal frame and a right horizontal frame,
each of the horizontal frames having an aslant pipe coupled backward to the
horizontal frames; a side wheel unit being set on each of the external side of
the front wheel and the back wheel, further comprising a connecting device, a contractible supporting base, and a side wheel; the connecting device is for
pivotally connecting the contractible supporting base and the horizontal frame, and using a sliding axle to pass through the components of the horizontal
frame, and in the meantime passing through and coupling to a bushing
corresponsive to contractible supporting base. The side wheel is pivotally
coupled to the external side of the contractible supporting base; the
contractible supporting base has at least one contractible rod such that the
bottom and the top of the contractible rod are pivotally coupled onto the
surface of the contractible supporting base and onto the frame body. Such
arrangement mainly makes use of the erection assistance and the contraction functions of the side wheel unit so that motorcycle riders can drive or make