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When Harley-Davidson rejected the idea, Treen decided to enter the market himself and designed his Servi-Cycle. [3] The Simplex Servi-Cycle was introduced in 1935. [3] Although Simplex Manufacturing Corporation produced motorcycles for over 20 years, the last Simplex Automatics looked almost the same as the company's original 1935 Simplex Servi ...
Cast magnesium disks, produced by one-step hot forging from magnesium alloys ZK60 and MA-14, are also used for many motorcycle wheels. At one time, motorcycles used wire wheels built up from separate components, but, except for dirtbikes, one-piece wheels are more common now. Performance racing motorcycles often use carbon-fibre wheels, but the ...
The earliest known use of a foot clutch and hand shifter, on motorcycles, was with the first multi-geared transmission on the 1915 Harley Davidson. [10] It is a mechanical linkage that is typically mounted to the left side of the motorbike's fuel tank and is held in place by a slotted piece of metal welded to the frame or the tank. [ 9 ]
In 1950 Showa acquired Rikuo Motorcycle, which made licensed versions of Harley Davidson motorcycles in the 1930s and 1940s. [4] Rikuo brand lasted until 1962. Showa has since become OEM supplier to Harley Davidson.
The Harley-Davidson VRSC (V-twin racing street custom), or V-Rod, is a line of V-twin cruiser motorcycles made by Harley-Davidson from 2002 until 2017. They are often called muscle bikes for their relatively high power output. The V-Rods are the first street motorcycles made by Harley-Davidson with overhead camshafts and liquid cooling.
In 1921, Otto Walker set a record on a Harley-Davidson as the first motorcycle to win a race at an average speed greater than 100 mph (160 km/h). [28] [29] Harley-Davidson put several improvements in place during the 1920s, such as a new 74 cubic inch (1,212.6 cc) V-Twin introduced in 1921, and the "teardrop" gas tank in 1925.