The document summarizes the history of motorcycles from the 1800s to present day in decades. It describes the first steam-powered motorcycle built in 1868. In the 1950s, it discusses popular models like the Diamond Free and Colleda COX. In the 1960s, it highlights the Suzuki T500 twin-cylinder bike and T20 250cc racer. The 1970s section focuses on the GS1000E and GS750 flagship models. The 1980s saw the RG250Γ racing replica dominate. Today, the motorcycle industry is booming with a wide selection of cruiser, sportbike, and standard/naked bike models.

1. The Years of Motorcycles By: Lauren

3. Built in 1868 by a steam engine

4. Sylvester Howard Roper 1869 Steam Cycle

5. Sylvester Howard Roper was builder.

6. World's first gasoline-driven motorcycle, the 1885 Daimler Reitwagen

11. bib http://www.totalmotorcycle.com/future.htm http://www.globalsuzuki.com/motorcycle/history/products/products_1950s.html http://www.globalsuzuki.com/motorcycle/history/products/products_1960s.html http://www.globalsuzuki.com/motorcycle/history/products/products_1970s.html