Abstract: This invention relates to the drive technique of bicycles, particularly two-wheel and rear-wheel driven ones. This invention comprises a front-wheel driver unit which moves rectilinearly and directly matches the front-wheel ratchet wheel, to drive the front wheel. It also contains a curvilinear rear-wheel driver unit which moves along a curve and directly matches the rear-wheel ratchet wheel to drive the rear wheel. The two-wheel driven bicycle has a head tube in the front to form a bracket to support the cyclist's shoulders so that the cyclist, while using his or her arms to steer the bicycle and drive the front wheel, does not have to make big effort to support his/her upper body. In the case of the rear-wheel driven bicycle, the identical rear-wheel driver unit used for said two-wheel driven bicycle is used, and the front wheel and the handlebars are just the same as that of a conventional bicycle.