| In 1901, the 21 year-old William S. Harley had | | | | the Milwaukee hills without pedal assistance. Harley |
| created the blueprint of an engine that was | | | | and Davidson developed further their motor after |
| designed to fit in a conventional bicycle. Two | | | | that experience.Immediately, they have created a |
| years later, William together with his friend Arthur | | | | bigger engine (405 cc or 24.74 cubic inches) that |
| Davidson started and developed a one-cylinder | | | | was become the very first and real |
| engine that was installed on a conventional bicycle | | | | Harley-Davidson motorcycle. Meanwhile, the first |
| during that time. However, this motorized-bicycle | | | | Harley-Davidson factory was in a 10 x 15-foot |
| was proved to be incapable of climbing through | | | | wooden shed. |