The bike boom or bicycle craze is any of several specific historic periods marked by increased bicycle enthusiasm, popularity, and sales.
Prominent examples include 1819 and 1868, as well as the decades of the 1890s and 1970s - the latter especially in North America - and the 2010s in the United Kingdom.
History of the bicycle#1817 to 1819: the draisine or velocipede
The first period which may be called a bicycle craze actually refers to a precursor of the bicycle which was propelled by being pushed along with the feet as the rider straddled the contraption, and had no pedals. This machine was invented by Baron Karl von Drais in Germany, and was called variously a "draisine" (English) or "draisienne" (French) after his name, a "velocipede" from the Latin terms for "fast foot", a "hobby horse", or a "dandy horse", the last name being perhaps the most popular. Drais got a patent for his invention in 1818, and the craze swept Europe and the United States during the summer of 1819 while many manufacturers (notably Denis Johnson of London) either copied Drais's machine or created their own versions, then quickly died out as many pedestrians began to feel threatened by the machines, and as municipalities passed ordinances prohibiting their use.
During the next 43 years, chiefly in England, inventors continued to explore the concept of human-powered transport, but on vehicles with three or four wheels (called "tricycles" and "quadracycles" respectively), which were thought to be more stable since they didn't require the balance necessary for two-wheeled vehicles. But none of these achieved much popularity.
History of the bicycle#1860s and the Michaux or "boneshaker"
In the early 1860s the first true bicycle was created in Paris, France, by attaching rotary cranks and pedals to the front wheel hub of a dandy-horse. The Olivier brothers recognized the commercial potential of this invention, and set up a partnership with blacksmith and bicycle maker Pierre Michaux, using Michaux's name, already famous among enthusiasts of the new sport, for the company.