Motorcycle history begins in the second half of the 19th century. Motorcycles are descended from the "safety bicycle," a bicycle with front and rear wheels of the same size and a pedal crank mechanism to drive the rear wheel. Despite some early landmarks in its development, motorcycles lack a rigid pedigree that can be traced back to a single idea or machine. Instead, the idea seems to have occurred to numerous engineers and inventors around Europe at around the same time.
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The excellence of Japanese motorcycles caused similar effects in all "Western" markets: many Italian bike firms either went bust or only just managed to survive. As a result BMW's worldwide sales sagged in the 1960s, but came back strongly with the introduction of a completely redesigned "slash-5" series for model year 1970.
From the 1960s through the 1990s, small two-stroke motorcycles were popular worldwide, partly as a result of the East German Walter Kaaden's engine work in the 1950s, later acquired by Suzuki via stolen plans supplied by MZ rider Ernst Degner, who defected to the West on 13 September 1961 after retiring from the 125cc Swedish Grand Prix at Kristianstad.
Harley-Davidson (HD) in the U.S. at the time suffered from the same problems as the European firms, but its unique product range, American tariff laws and nationalism-driven customer loyalty allowed it to survive. One alleged flaw, however, was retaining the characteristic HD 45° engine vee-angle, which causes excess vibration as well as the loping HD sound.
A factory full fairing was introduced by BMW motorcycles in the R100RS of 1977, the first factory fairing produced in quantity.In 1980, BMW stimulated the "adventure touring" category of motorcycling with its dual-sport model, the R80G/S. In 1988, BMW was the first motorcycle manufacturer to introduce anti-lock-brakes (ABS) on its sporting K100RS-SE and K1 models