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1920s


1920By 1920, Harley-Davidson is the largest motorcycle manufacturer in the world. New Harley-Davidson® motorcycles can be purchased from over 2,000 dealers in 67 countries worldwide. 
Leslie "Red" Parkhurst breaks 23 speed records on a Harley-Davidson 61 cubic inch racing motorcycle. Also, the "hog" association starts when the racing team's mascot, a pig, is carried on a victory lap after each race won by the team. 
1922The first 74 cubic inch V-twin engine is introduced on the JD and FD models. Harley-Davidson dealerships are now found in sixty-seven countries. 
Harley-Davidson riders sweep all eight National Championship races. 
1925Gas tanks on all models now have a distinct teardrop shape. This basic appearance is set for all subsequent Harley-Davidson motorcycles. 
Joe Petrali begins racing for Harley-Davidson. He would become one of the most successful dirt-track racers for Harley-Davidson, and one of the most successful racers of all time. 
1926Single-cylinder motorcycles are again sold by Harley-Davidson for the first time since 1918. Models A, AA, B, and BA are available in side-valve and overhead-valve engine configurations. 
1928The first Harley-Davidson two cam engine is made available to the public on the JD series motorcycles. The bike is capable of top speeds between 85 - 100 mph. 
Front wheel brakes are now available on all Harley-Davidson motorcycles. 
1929The 45 cubic inch V-twin engine (later to be known as the "flathead") is introduced on the D model. The engine proves to be so reliable that variations of it are available on Harley-Davidson motorcycles as late as 1973.