History of the motorcycle by 1902, and would rise to 32,000, its best ever, in 1913. Indian produced over 20,000 bikes per year. The oldest surviving Russian-manufactured motorcycle, the Rossiya, dates from 1902. The American company Harley-Davidson started producing motorcycles in 1903. During this period, experimentation and innovation were driven by the popular new sport of motorcycle racing, with its powerful incentive to produce tough, fast, reliable machines. These enhancements quickly found their way to the public's machines. Chief August Vollmer of the Berkeley, California Police Department is credited with organizing the first official police motorcycle-patrol in the United States in 1911. By 1914,
Motorcycle racing 1200 cc for twins, and between 750 cc and 1000 cc for four cylinder machines. The motorcycles must maintain the same profile as their roadgoing counterparts. The overall appearance, seen from the front, rear and sides, must correspond to that of the bike homologated for use on public roads even though the mechanical elements of the machine have been modified. Supersport racing is another category of motorcycle road racing that employs modified production motorcycles. To be eligible for Supersport racing, a motorcycle must have a four-stroke engine of between 400 and 600 cc for four-cylinder machines, and between 600 and