Though the popular manufacture of dirt bikes, or off-road style motorcycles, became more widespread in the 1960s, individual riders had been modifying their motorcycles for off-road capabilities for decades prior. Before the advent of mass manufactured off-road bikes in the mid-1900s, off-road motorcycling enthusiasts drove regular street bikes onto rugged terrain. This often meant that individuals would ride heavy, short Harley Davidson motorcycles off of paved roads and into muddy, wet and sandy conditions, typically getting stuck a lot on the way.
Many Americans were exposed to the lighter, more agile European style of motorcycle during World War II, and this piqued interest in the possibility of a type of motorcycle adventure that could be carried out in forests and other unpaved areas. Immediately after the war, European brands such as Ducati and BMW became popular, and as more time passed after the war and Japanese industry began to rebound, popular lightweight motorcycles were imported from brands such as Honda and Suzuki. Overall, the evolution of the dirt bike was a relatively gradual process.