The Harley-Davidson Fat Boy gave its name to the company’s “fat custom” cruiser style after its 1990 debut.
The Fat Boy was introduced as an FLSTF model in 1990. Its design emphasized broad tires, solid-looking cast wheels, a substantial front end, and a muscular Softail silhouette. The styling made the motorcycle visually distinctive within Harley-Davidson’s cruiser lineup.
The model was created during an important period of Harley-Davidson product development, when the company was expanding its factory-custom offerings beyond traditional touring motorcycles and Sportsters. The Fat Boy became one of the best-known names in the Softail family.
Fat Boy is often confused with Fat Bob because the names both reference a broad, muscular appearance. They are separate model lines: Fat Boy originated in the Softail family, while Fat Bob belongs to Harley-Davidson’s other cruiser and performance-oriented ranges.