Vintage Bicycle Patent Diagram - Historical Bike Design & Engineering #161605 (License: Personal Use)

This black-and-white technical drawing depicts a classic safety bicycle design with numbered annotations identifying parts such as the frame (1), crankset (3, 4), chainring (18), rear hub (22), and spoke pattern (21, 24). The diagram reflects early 20th-century engineering standards, emphasizing triangulated frame construction and direct-drive mechanics before derailleurs became common. It likely originates from a patent filing, serving both legal documentation and educational purposes.

Used in historical cycling archives, museum exhibits, patent databases, or educational content about transportation evolution; targets users researching vintage bike mechanics, patent history, or industrial design.