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Bicycle drivetrain systems are used to transmit power on bicycles, tricycles, quadracycles, unicycles, or other human-powered vehicles from the riders to the drive wheels. Most also include some type of a mechanism to convert speed and torque via gear ratios .
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The standard Presta valve has an external thread. An adapter can be fitted onto this external thread to permit the Presta valve to be connected to a pump with a Schrader chuck. The same adapter, because of a coincidence of thread sizes, may be able to convert a Schrader pump into one that can connect to flexible adapters of either kind. [4]
A child riding a Big Wheel tricycle. Big Wheel is a brand of low-riding tricycle, made mostly of plastic, with a large front wheel and shallow seat.Introduced by Louis Marx and Company in 1969 and manufactured in Girard, Pennsylvania, the Big Wheel was a popular toy in the 1970s in the United States, partly because of its low cost and partly because consumer groups said it was a safer ...
One example is the Protean two-speed derailleur available on the Whippet safety bicycle. [4] The French bicycle tourist, writer and cycling promoter Paul de Vivie (1853–1930), who wrote under the name Vélocio, invented a two speed rear derailleur in 1905 which he used on forays into the Alps. [5]
Klein was a bicycle company founded by Gary Klein that pioneered the use of large diameter aluminium alloy tubes for greater stiffness and lower weight. Klein produced his first bicycle frames while a student at the Massachusetts Institute of Technology during the 1970s, and full production runs of frames began in the 1980s.
In 1895, he built the first women's bicycle for Queen Margaret of Italy. At the same time, he began using his bicycles at sporting events to test new technical developments. [3] In 1897, tests began on a bicycle with an auxiliary motor. A De Dion-Bouton built-in motor was mounted in front of the bicycle handlebars and drove the front wheel. [3]
Bicycle playing cards are sold in a variety of designs, the most popular being the Rider Back design (No. 63). [3] They are available with standard indexes in poker size (3.5 by 2.5 inches [8.9 cm × 6.4 cm]), bridge size (3.5 by 2.25 inches [8.9 cm × 5.7 cm]), [ 4 ] and pinochle decks, "Jumbo Index" poker decks and Lo Vision cards that are ...