El desenvolupament de la bicicleta
Invented in Germany in 1817, the world's first bicycle was a two-wheeled wooden vehicle that could be straddled and propelled by fast walking. It was invented to meet the need for horseless transportation during a time of oat shortage, calling it the laufmaschine or "treadmill". Built almost entirely of wood, it weighs 22kg and has no pedals, but what it lacks in practicality it makes up for in speed. On its maiden flight, the bike covered 13 kilometers in less than an hour.
L'any 1960, el pare i el fill van dirigir una empresa que fabricava-carruatges de cavalls a París, i van muntar per primera vegada una bicicleta de dues-rodes cap al 1867. La bicicleta es propulsa com un tricicle, amb el bielas i pedals units a la roda davantera.
La primera bicicleta de marxa és llançadad in1871. Pneumatic tires is in 1888
John Boyd Dunlop is a Scottish veterinarian living in Belfast. His son complained that the cobbled streets made his hips sore as he biked to school. Dunlop solved his son's problem by inventing the inner tube and patented a pneumatic tire, which is essentially a hose tube inside an outer rubber tire with a tread. But it was withdrawn two years later due to a previous patent by Scottish inventor Robert William Thompson.
Bicicletes de seguretat
The term safety bike was used in the 1880s to refer to any alternative to the penny, and it sparked a bike craze due to being lighter, cheaper, and easier to ride. Unlike penny farthings, the rider's feet are within range of the ground, making it easier to stop, greatly reducing the risk of "heading" or falling over the handlebars for extended periods of time. The bicycle's impact on women's liberation was enormous and became a symbol of the new woman, at the heart of the "dress for reason" movement of the late 19th century.
Sportsbicicleta
In the 1890s, women's versions of sports car designs were already very popular. It has a stepped frame, rather than the diamond-shaped frame of the gentleman's style, so that ladies can wear dresses and skirts for easy rides and bikes, and often comes with skirt guards to keep skirts and dresses from getting tangled. rear wheel and spokes. Like the men's sports car, the frame is steel, and the frame and handlebars are positioned to give the rider a very upright riding position. Although they originally came with front scoop brakes, technological advancements meant that later models came with much-improved coaster brakes or lever-actuated rim or drum brakes.
Bicicleta BMX
Les bicicletes BMX són bicicletes-construïdes específicament, normalment amb rodes de 16 a 24 polzades (les rodes de 20 polzades són estàndard) i es van originar a Califòrnia a principis dels anys setanta, quan els adolescents imitaven els seus herois de motocròs a les bicicletes. In the Netherlands, children race on standard road bikes on an off-road track. The 1971 motorcycle racing documentary On Any Sunday is generally credited with sparking a national movement in the United States. In the opening scene, the kids ride their Schwinn Sting-Rays off-road. It wasn't until the middle of the century that the sport reached critical mass and manufacturers started making bikes specifically designed for the sport.
Bicicleta de muntanya
El 1981, es va introduir la primera bicicleta de muntanya-produïda en sèrie, dissenyada per utilitzar-la fora de-paviment en una varietat de superfícies. Va ser un èxit immediat, i a la dècada de 1980 la ràpida eliminació d'exemples de les prestatgeries minoristes, la novetat dels vehicles tot terreny i el desig creixent dels habitants de la ciutat d'escapar del seu entorn amb bicicleta de muntanya i altres esports extrems van inspirar la seva popularitat. Aquestes bicicletes compten amb quadres més forts, pneumàtics més amples i poms més grans per augmentar la tracció, una posició de seient més vertical (per a una millor visibilitat i estalvi de pes) i una varietat creixent de dissenys de suspensió davantera i posterior. L'any 2000, les vendes de bicicletes de muntanya havien superat amb escreix a les curses. , esport/curses i bicicletes de turisme.
Per als entusiastes de la bicicleta, l'adveniment de les bicicletes és l'adveniment d'una cosa bella, una font de felicitat, i les bicicletes ens han aportat molts beneficis independentment del període de temps. Des de millorar la nostra velocitat de viatge fins a la recerca actual de viatges amb baixes-emissions de carboni, és de gran importància.
