In the 1950s and early 1960s, Vespa and Lambretta scooters were raced competitively against motorcycles, often winning the races. In the mid 1960s, motorcycle engines became larger and faster, and a gap was created—along with varying cc classifications. Since the 1980s, Vespa and Lambretta racing has grown into a serious sport in the United States. There are various classes in the United States, depending on the racing association. They are generally:
- Small Frame Class: Open class up to 152 cc's
- Automatics Class
- Specials Class
- Stock Class: Large-frame Vespa and Lambretta 180 & 200 cc scooters.