
Celebrate the engine that changed the motorcycle world. Harley-Davidson Knucklehead tells the entire Knucklehead story--accompanied by modern and period photography--from the very first overhead-valve V-twin Harley produced for the public through the post-war models,...

Celebrate the 80th anniversary of the engine that changed the motorcycle world. Motorcycle technology lagged far behind automotive technology since the earliest days of the internal-combustion engine. All that changed in 1936 when Harley-Davidson introduced the Model EL. For...