The 1930s Harley-Davidson Motorcycles Channel features some of the earliest models around. Check out vintage Harleys at HowStuffWorks.
1936 Harley-Davidson EL
The 1936 Harley-Davidson EL motorcycle introduced the famous Knucklehead engine to the Harley line. It became one of the most popular Harley-Davidson models of all time. See pictures and learn more about the Harley EL.