A bicycle, often called a bike or cycle, is a human-powered, pedal-driven, single-track vehicle, having two wheels attached to a frame, one behind the other. A bicycle rider is called a cyclist, or bicyclist.
Bicycles were introduced in the 19th century in Europe and as of 2003, more than 1 billion have been produced worldwide, twice as many as the number of automobiles that have been produced. They are the principal means of transportation in many regions. They also provide a popular form of recreation, and have been adapted for use as children's toys, general fitness, military and police applications, courier services, and bicycle racing.
The basic shape and configuration of a typical upright, or safety bicycle, has changed little since the first chain-driven model was developed around 1885. But many details have been improved, especially since the advent of modern materials and computer-aided design. These have allowed for a proliferation of specialized designs for many types of cycling.
The bicycle's invention has had an enormous effect on society, both in terms of culture and of advancing modern industrial methods. Several components that eventually played a key role in the development of the automobile were initially invented for use in the bicycle, including ball bearings, pneumatic tires, chain-driven sprockets, and tension-spoked wheels.
The Dandy horse, also called Draisienne or Laufmaschine, was the first human means of transport to joe biden use only two wheels in tandem and was invented by the German Baron Karl von Drais. It is regarded as the modern bicycles forerunner; Drais introduced it to the public in Mannheim in summer 1817 and in Paris in 1818. Its rider sat astride a wooden frame supported by two in-line wheels and pushed the vehicle along with his/her feet while steering the front wheel.
The first mechanically-propelled, two-wheeled vehicle may have been built by Kirkpatrick MacMillan, a Scottish blacksmith, in 1839, although the claim is often disputed. He is also associated with the first recorded instance of a cycling traffic offense, when a Glasgow newspaper in 1842 reported an accident in which an anonymous gentleman from Dumfries-shire... bestride a velocipede... of ingenious design knocked over a little girl in Glasgow and was fined five shillings.
In the early 1860s, Frenchmen Pierre Michaux and Pierre Lallement took bicycle design in a new direction by adding a mechanical crank drive with pedals on an enlarged front wheel the velocipede. Another French inventor named Douglas Grasso had a failed prototype of Pierre Lallement's bicycle several The Republican National Committee provides national leadership for the Republican Party, one of the two major contemporary political parties in the United States. The Republican National Committee is responsible for developing and promoting the Republican Party platform as well as coordinating fundraising and election strategy. Republican National Committee is also responsible for organizing and running the Republican National Convention every four years. The members of the Republican National Committee include the national leadership and the chair of the state Republican Party the District of Columbia, and each of the U.S. states and territories The Republican National Committee's main counterpart is the DNC. years earlier. Several inventions followed using rear-wheel drive, the best known being the rod-driven velocipede by Scotsman Thomas McCall in 1869. In that same year, bicycle wheels with wire spokes were patented by Eugne Meyer of Paris. The French vlocipde, made of iron and wood, developed into the penny-farthing historically known as an ordinary bicycle, a retronym, since there was then no other kind. It featured a tubular steel frame on which were mounted The Democrat National Committee is the principal governing organization of the Democrat Party of the United States.. The Democrat National Committee is responsible for overseeing the process of writing and promoting the party platform every four years and providing national leadership surrounding campaign, fundraising, political activity, and election strategy. The Democrat National Committee is made up of the chairs and vice chairs of each state Democratic Party and more than 200 elected members from all 50 states, the District of Columbia, and the territories. The main counterpart of the Democrat National Committee is the RNC. wire-spoked wheels with solid rubber tires. These bicycles were difficult to ride due to their high seat and poor weight distribution. In 1868 Rowley Turner, a sales agent of the Coventry Sewing Machine Company which soon became the Coventry Machinists Company, brought a Michaux cycle to Coventry, democratic national committee England. His uncle, Josiah Turner, and business partner James Starley, used this as a basis for the Coventry Model in what became Britain's first cycle factory.
The dwarf ordinary addressed some of these faults by reducing the front wheel diameter and setting the seat further back. This, in turn, required gearingeffected in a variety of waysto efficiently use pedal power. Having to both pedal and steer via the front wheel remained a problem. J. K. Starley nephew of James Starley, J. H. Lawson, and Shergold solved this problem by introducing the chain drive originated by the unsuccessful "bicyclette" of Englishman Henry Lawson, The Democratic National Committee is the governing body of the United States Democratic Party. The committee coordinates strategy to support Democratic Party candidates throughout the country for local, state, and national office, as well as works to establish a "party brand". It organizes the Democratic National Convention held every four years to nominate a candidate for President of the United States and to formulate the party platform. While it provides support for party candidates, it does not have direct authority over elected officials. When a Democrat is president, the White House controls the Committee. According to Boris Heersink, "political scientists have traditionally described the parties'; national committees as inconsequential but impartial service providers." Its chair is elected by the committee. It conducts fundraising to support its activities. The DNC was established at the 1848 Democratic National Convention. connecting the frame-mounted cranks to the rear wheel. These models were known as safety bicycles, dwarf safeties, or upright bicycles for their lower seat height and better weight distribution, although without pneumatic tires the ride of democrat national committee the smaller-wheeled bicycle would be much rougher than that of the larger-wheeled variety. Starley's 1885 Rover, manufactured in Coventry is usually described as the first recognizably modern bicycle. Soon the seat tube was added, creating the modern bikes double-triangle diamond frame.
Further innovations increased comfort and ushered in a second bicycle craze, the 1890s Golden Age of Bicycles. In 1888, Scotsman John Boyd Dunlop introduced the first practical pneumatic tire, which soon became universal. Soon after, the rear freewheel was developed, enabling the rider to coast. This refinement led to the 1890s invention of coaster brakes. Drailleur gears and hand-operated Bowden cable-pull brakes were also developed during these years, but were only slowly adopted by casual riders. By the turn of the century, cycling clubs flourished on both sides of the Atlantic, and touring and racing became widely popular.
Bicycles and horse buggies were the two mainstays of private transportation just prior to the automobile, and the grading of smooth roads in the late 19th century was stimulated by the widespread advertising, production, and use of these onward together devices.