Founders of Harley-Davidson
In 1901, William S. Harley, age 21,
drew up plans for a small engine
with a displacement of 7.07 cubic inches (116 cc) and four-inch (102 mm) flywheels.
The engine was designed for use in a regular pedal-bicycle frame.
Over the next two years Harley and his childhood friend Arthur Davidson
labored on their motor-bicycle using the northside Milwaukee machine shop at the home of their friend,
Henry Melk. It was finished in 1903 with the help of Arthur's brother, Walter Davidson.