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The 1905 Harley-Davidson motorcycle had to be pedaled like a bicycle to get started. See pictures and learn about this Harley-Davidson motorcycle.

The 1920 Harley-Davidson 20-J was part of the Harley racing team that dominated in the 1920s. See pictures and learn about this Harley-Davidson bike.

The 1931 Harley-Davidson Model D motorcycle featured a new flathead engine. See pictures and learn about this classic Harley-Davidson motorcycle.

The 1947 Harley-Davidson Servi-Car was used by auto repair shops to make house calls. See pictures and learn about this Harley-Davidson motorcycle.

The 1951 Harley-Davidson Police Special motorcycle was used by law enforcement agencies. See pictures and learn about this Harley-Davidson bike.

The 1952 Harley-Davidson FL Hydra-Glide introduced a new hand-shift/foot-clutch setup. See pictures and learn about this Harley-Davidson motorcycle.

The 1955 Harley-Davidson FL Hydra-Glide motorcycle offered a host of chrome options. See pictures and learn about this Harley-Davidson motorcycle.

The 1959 Harley-Davidson Police Special was equipped with a siren and a fire extinguisher. See pictures and learn about this Harley-Davidson bike.

The 1959 Harley-Davidson XLCH Sportster was lighter and faster than its sibling XLH. See pictures and learn about this Harley-Davidson motorcycle.

The 1963 Harley-Davidson FL Duo-Glide motorcycle featured a powerful Big Twin engine. See pictures and learn about this Harley-Davidson motorcycle.