The first motorcycles were essentially motorized bicycles, which explains why early Harley-Davidson models from the 1900s featured bicycle pedals. These pedals were crucial for assisting the underpowered engines on hills and for starting the machine.
The initial models, with small single-cylinder engines, could only reach low speeds. Pedals were needed to help propel the bike and, in later iterations, to charge the battery for ignition. Starting required pedaling to build enough compression and power for the engine to turn over.
By the 1915 model, pedals were still present but primarily served as an alternative starting method alongside a kick-starter. This era highlights how motorcycles evolved from pedal-assisted bicycles into distinct vehicles as engine technology advanced.
Beyond pedals, early Harleys shared other bicycle traits, like a rigid frame without suspension, making for a rough ride. Suspension systems were introduced gradually, with a telescopic fork becoming standard much later.
Interestingly, the rise of modern electric bikes is once again blurring the lines between bicycles and motorcycles, echoing the hybrid origins of these early machines.