11. A bicycle and a leverage plate for transforming a bicycle pedal arm into a first-class lever for propelling the bicycle, wherein the bicycle includes a frame, a steering mechanism attached to the frame, a seat attached to the frame for seating a rider, a front wheel rotatably secured to the frame and to the steering mechanism on a front end of the frame, a drive wheel rotatably secured to a rear end of the frame, the drive wheel having a drive gear sprocket for rotating the drive wheel as a driving wheel, a main gear sprocket secured to a gear side of the frame about midway between the front and drive wheels, and a drive-transmitting endless-loop chain secured between the main gear sprocket and the drive gear sprocket so that a revolving motion of the main gear sprocket in a clockwise direction around a view-directional axis, wherein the view-directional axis is aligned and oriented in a view-direction that first passes through the main gear sprocket, then passes through the gear side of the frame, and then passes through and away from a non-gear side of the frame, revolves the drive gear sprocket and the drive wheel to move the bicycle in a desired forward moving direction, a pair of leverage plates secured to opposed ends of a drive axle passing through the main gear sprocket and the frame, wherein each leverage plate comprises:a. an outer planar surface and an opposed frame-side planar surface, the planar surfaces defining a plate throughbore passing through the opposed surfaces of the leverage plate, wherein the drive axle is dimensioned to be secured to the plate throughbore and to pass through an axle throughbore of the main gear sprocket;
b. a pedal arm attachment post secured to and protruding from the outer planar surface of the leverage plate in a direction away from the bicycle frame, the pedal arm attachment post being positioned between the plate throughbore and a perimeter edge of the leverage plate;
c. a pedal arm having an inner end and an opposed outer end, the inner end being secured to the pedal arm attachment post so that the outer end of the pedal arm extends in a direction about parallel to the outer planar surface of the leverage plate and extends beyond the perimeter edge of the leverage plate, the pedal arm attachment post securing the pedal arm against removal from the attachment post, the pedal arm also including an inward side and an opposed outward side, wherein the inward side is closer to the plate throughbore than the outward side of the pedal arm;
d. a pedal rotatably secured to the outer end of the pedal arm so that rotation of the pedal through a 360 degree rotation moves the pedal arm, the leverage plate, the drive axle and the main gear sprocket through a 360 degree rotation around the plate throughbore;
e. a counterclockwise stop post secured to and extending away from the leverage plate in a direction parallel to the pedal arm attachment post and positioned on the leverage plate closer to the perimeter edge of the leverage plate than the pedal arm attachment post, and also positioned closer to the outer end of the pedal arm than the pedal arm attachment post to thereby stop rotation of the pedal arm around the pedal arm attachment post in a counterclockwise direction beyond the counterclockwise stop post; and,
f. the pedal arm attachment post, the counterclockwise stop post and the pedal arm being cooperatively configured so that the pedal arm is secured to pivot about the pedal arm attachment post between the counterclockwise stop post and the drive axle passing through the plate throughbore, and so that, whenever the pedal moves from about a twelve o'clock position above the pedal arm attachment post to about a twelve o'clock position above the plate throughbore, wherein above is a direction opposed to a direction of a pull of gravity, the pedal arm moves from adjacent the counterclockwise stop post to adjacent the drive axle extending from the plate throughbore to transform the drive axle into a fulcrum of a pedal arm first-class lever, thereby providing a mechanical advantage to any force being applied in the direction of the pull of gravity to the pedal, to the pedal arm, to the drive-axle fulcrum, and to the pedal attachment post, to thereby facilitate rotation of the leverage plate, the drive axle and the main gear sprocket while the pedal rotates in the clockwise direction from the about twelve o'clock position above the plate throughbore to about a six o'clock position below the plate throughbore.