NOVELTY - A multi-functional bicycle, with a frame, front fork frame, rear-wheel fork frame, front wheel, rear wheel, handlebars, seat, pedal board, large tooth plate, after tooth plate, the main chain and other necessary parts to change and additional; One is to change the tire structure, and are not afraid of puncture leakage or puncture, durable; the other is to change the tire for the color, rotating clear reminder to cars, to avoid a collision; the third is to install larger than the rim of the tire, and wheels and tires in the big gap between the installation of a ratchet or oblique axis of the groove gear, with the adjustment rod, visible in different road conditions at any time adjust the tire's book on the ground and the soil fertility; the fourth is in the frame of the fork mouth, an additional bearing, and shaft, wheels and drums, the three forming an integrated whole rotation, so that the axis of rotation may be convergence with the buoyancy and paddle equipped to facilitate the plains, water, beach, desert or Driving snow, a multi-purpose bicycle; its five grooves in the rotating ratchet or helical gear axis, can link to other wheels, and make 2-6 transformation driving; its 6 in the body of the back-end, the installation caudal fin, and by the consolidation of the rear wheel axis of rotation of the L-bracket, tilt-type shaft or eccentric shaft to drive forward swing tail fin; its seven in the first frame end, an additional tooth plate, and to the chain plate and connects to the front teeth After the tooth plate, in order to front-wheel rear-wheel drive, and then drive engagement grooves in the front top of the ratchet or helical gear, and by the consolidation of the rotation axis of the L-bracket, tilt-type shaft or eccentric shaft to drive both sides of the wings, vibration off; the eight are in the car to install electrical or other impellers, installing roof hood, the former cover, wipers and front and rear lights, as the most environmentally friendly light bicycle; its nine in the hood, or both sides of the wings, installing solar panels, and use of solar car motor and foot, a common driver, in the case consisting of multi-functional bicycles, do not, they can unload at any time to restore the original single-speed, variable speed, or folding bicycle.