Harley-Davidson Motorcycles is the iconic American motorcycle manufacturer. Founded out of a small shed in 1903 by William S. Harley and brothers Arthur and Walter Davidson in Milwaukee, Wisconsin. The Motor Company produces traditional cruiser motorcycles utilizing air-cooled 45-degree V-Twin engines. Popular models include the Sportster, Road King, Electra Glide, Dyna Glide and Softail. The Harley-Davidson Motorcycles has also started producing a liquid-cooled Twin with its V-Rod lineup. History of Harley-Davidson Motorcycles