The workbook is intended to provide personnel having responsibility for bicycle investigations or inspections with an overview and technical information on bicycles which will serve as a technical foundation for understanding the bicycle regulations. It discusses bicycles in general, and introduces the user to the specific parts of bicycles. On completion of the workbook participants should be able to complete the following objectives: (1) define the different types of bicycles, including their distinguishing features; (2) identify the factors that contribute to bicycle accidents; (3) identify the five major systems of bicycles; and (4) locate and describe specific parts of bicycles. Part 1 (12 pages) discusses briefly the history of bicycles, types of bicycles, the bicycle market, and bicycle accidents. Part 2 (41 pages) discusses in detail the various parts of the bicycle: seat, steering system, frame system, wheel system, drive system, and brake systems (coaster or pedal-operated brakes and caliper or hand-operated brakes). Exercises and answer keys accompany each section. Detailed illustrations and diagrams are found throughout the document. The document concludes with three appendixes: bicycle illustrations for different types of bicycles, glossary of bicycle terms, and a bibliography. (Author/BP)