According to Official Guinness Records,
The earliest internal combustion-engined motorized bicycle was a wooden-framed machine built at Bad Cannstatt, Germany between October-November 1885 by Gottlieb Daimler (1834-1900) and first ridden by Wilhelm Maybach (1846-1929). It had a top speed of 19 km/h (12 mph) and developed 0.37 kW (0.5 hp) from its single-cylinder 264cc four-stroke engine at 700 rpm. Known as the `Einspur', it was lost in a fire in 1903.
For a complete list of 1900 records, please visit 1900 Guinness Records in Germany.