Indian Motocycle Manufacturing Company color options in 1934. Models of that era had Indian's famous war bonnet logo on the gas tank. Indian's huge Springfield factory was known as the Wigwam, and native American imagery was much used in advertising. In 1940, Indian sold nearly as many motorcycles as its major rival, Harley-Davidson. During this time, Indian also manufactured other products such as aircraft engines, bicycles, boat motors and air conditioners. The Indian Scout was built from 1920 through 1949. It rivaled the Chief as Indian's most important model. The Scout was introduced for 1920. Designed by Charles B. Franklin, the Scout had its
Harley-Davidson by the Davis Machine Company from 1917 to 1921, when Davis stopped manufacturing bicycles. By 1920, Harley-Davidson was the largest motorcycle manufacturer in the world, with 28,189 machines produced, and dealers in 67 countries. In 1921, a Harley-Davidson, ridden by Otto Walker, was the first motorcycle ever to win a race at an average speed greater than . During the 1920s, several improvements were put in place, such as a new 74 cubic inch (1,212.6 cm³) V-Twin, introduced in 1921, and the "teardrop" gas tank in 1925. A front brake was added in 1928 although notably only on the J/JD