What milestone does the year 1890 often represent in the conflicting timelines of motor bike development?

Answer

The period when European inventors accelerated applying engines to existing cycling technology

The year 1890 appears in discussions because it signifies a period of rapid acceleration following Daimler's initial breakthrough. During this time, various European inventors were actively taking the concept of attaching newly developed internal combustion engines onto existing bicycle designs. Although these results were often motorized bicycles rather than purpose-built motorcycles, 1890 marks the intensified commercial and technological exploration phase that rapidly moved personal motorized transport closer to realization.

What milestone does the year 1890 often represent in the conflicting timelines of motor bike development?
inventionVehiclefirstYearmotorcycle