The bicycle is a two-wheeled machine that uses momentum, force, and friction to allow riders to travel faster than walking while using far less energy. Invented in 1817 by a German named Karl Drais, the first bicycles did not have pedals but were steered by turning the handlebars. Adding pedals and metal to the frame led to the invention of the bicycle as we know it today in the 1860s. The bicycle’s popularity as a form of transportation and recreation has caused significant changes to many parts of the world, and its use is widespread and continues to expand.
Although some people argue over who really invented the bicycle, there is no doubt that it has had a major effect on human society. It has reduced crowding in inner-city tenements and allowed workers to commute to their jobs outside the city, and it has enabled people to enjoy leisure activities such as bicycling without having to go on long walks. Bicycling is a healthy exercise that can help reduce obesity, strengthen muscles and bones, improve cardiovascular health, and keep the heart strong.
There are many different kinds of bicycles, and there are many ways to customize a bicycle for riding, racing, or work. The basic components of a bicycle include the frame, wheel, and seat. Frames are usually made of steel, aluminum, or titanium. Today’s frames are lighter and stronger than ever before, and the shape and material of the frame can influence the riding experience.
The wheel is connected to the frame by the axle, and the frame is attached to the seat by the stem. The seat can be adjusted to fit the rider, and is typically raised or lowered by moving the saddle. This can be done to make the bike more comfortable or to change the angle of attack, which determines how hard or soft the rider must push on the pedals.
A bicycle can be modified with accessories such as baskets, tool racks, and mudguards to carry cargo or protect the rider from rain. Parents often add rear-mounted child seats or a hitch to their bicycles in order to tow children or cargo. A bicycle can also be equipped with a suspension system to absorb shock and make the ride more comfortable.
People who have traumatic injuries from collisions with bicycles or falls while riding may need treatment by emergency medicine physicians, neurologists, orthopedic surgeons, oral surgeons, or physical therapists. Overuse injuries such as tendinitis or knee pain can be treated by physical therapists. In addition, there are a number of medications that can be used to treat symptoms such as dizziness or nausea.