Bicycle structure

1. Body parts: including

Frame, front fork, handlebar, seat and front fork are the main parts of a bicycle. The transmission part includes pedal, crank, sprocket, chain, central shaft and flywheel. The pedal is stepped by manpower, and the wheel is driven to rotate and drive forward through the transmission parts.

2. Action part: front wheel and rear wheel, including front wheel and rear wheel axle, spokes, rims (rims), tires, etc.

3. Safety devices: including brakes (brakes), lights, bells, mirrors, etc.

Some accessories can be added as needed, such as brackets, clothes hangers, safety forks, fenders, air pumps, etc. In addition, sports cars, racing cars and mountain bikes equipped with speed change mechanisms are also equipped with speed change controllers and front and rear derailleurs.

4. The composition of the hand-foot dual-power bicycle: A box made of alloy is added to the frame of the traditional bicycle, which contains various transmission parts. Through the interaction of forces, the dual power of hands and feet can be realized. Simply push and pull the handlebar, and the bicycle can move forward with the handlebar, which is both labor-saving and fitness.

use

From the beginning until today, bicycles have been used for many purposes. From a practical point of view, bicycles are used for transportation, bicycle commuting and practical bicycles. It can be used as a "work horse" for postmen, nurses, policemen, messengers and general delivery services. Military uses of bicycles include communication, reconnaissance, troop movement, supply and patrol. See also Bicycle Infantry.

Bicycles are also used for leisure purposes, such as cycling, mountain biking, fitness and games. Cycling competitions include car racing, bmx racing, track racing, lap racing, roller skating, sports cars and time trials. The main multi-stage professional events are the Tour de France in Italy, the Tour de France in France, the Tour de France in Spain, the Tour de France in Portugal and the Tour de Walter.

Bicycles can be used for entertainment and leisure, such as organized mass cycling, artistic cycling and freestyle cycling cross-country.

Refer to the above? Baidu encyclopedia-bicycles