Motorcycle a three-speed gearbox and belt transmission. It was so popular with its users that it was nicknamed the "Trusty Triumph." By 1920, Harley-Davidson was the largest manufacturer, with their motorcycles being sold by dealers in 67 countries. In the 1950s, streamlining began to play an increasing part in the development of racing motorcycles and the "dustbin fairing" held out the possibility of radical changes to motorcycle design. NSU and Moto Guzzi were in the vanguard of this development, both producing very radical designs well ahead of their time. NSU produced the most advanced design, but after the deaths of four
Dual-sport motorcycle a 250 cc two-stroke engine. Other manufacturers soon followed with similar models called "enduros". These light weight machines were good on trails and adequate on pavement. Some manufacturers approached the trend from the opposite direction, beginning with a street motorcycle and modifying it for adequate off-road performance. For instance, the Honda CL350 Scrambler was a variation on the Honda CB350 street motorcycle with high exhaust pipes, a larger front wheel, dirt-oriented tires, and lower gearing. Over the next 20 years, manufacturers began producing heavier and less dirt worthy enduros based on four-stroke engines, as they searched for better combinations of