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
American Historic Racing Motorcycle Association American Historic Racing Motorcycle Association The American Historic Racing Motorcycle Association (AHRMA) is a vintage motorcycle racing origination that puts on mostly motorcross races, but also holds road racing, dirt flat track, and trials events. The AHRMA was formed in 1984 by Robert Iannucci and Jeffrey Elghanayan as a private business. In 1989 it was reorganized as a member owned non profit organization. During the 70s and 80s groups of riders began emerging around the nation organizing vintage motorcycle racing events. This started primarily with vintage roadracing clubs who were then joined by motocross, trials, dirt track and concours enthusiasts.