Motrice Pia

The Motrice Pia was an early three-wheeled vehicle, introduced by Italian Enrico Bernardi, and credited as the first motorcycle by sources such as the Enciclopedia Italiana di Scienze, Lettere ed Arti.^[1] The exact year of introduction depends on which one of the following milestones one considers: the demonstration of a gasoline engine in 1882–1884 (first used to power a sewing machine),^[2][3] the application of the engine to a child's tricycle in 1884,^[4] the application of this engine to a motorized tricycle (or low cart) in 1893,^[2][5] or the mounting of the motor behind a bicycle on a one-wheel trailer via chain drive creating a "motorcycle" in 1894.^[2]

Motrice Pia

Engine of La motrice Pia
Manufacturer	Enrico Bernardi (inventor)
Assembly	1884 one-off
Engine	122.5 cc single-cylinder, water cooled, gasoline engine with cast iron cylinder
Bore / stroke	44 mm x 80.5 mm
Power	0.024 bhp at 200 rpm
Frame type	Wooden tricycle
Fuel capacity	0.2 L (0.044 imp gal; 0.053 US gal)

Specifications

Specifications in the box accompanying the article are from Museo Nicolis and refer to the 1884 tricycle.^[4]