The most powerful Vespa scooters reach a top speed of 80 miles per hour with 250 cc fuel-injected engines. The scooters with less power travel slower than that, with the 50 cc scooters reaching speeds of about 40 mph and 155 cc models achieving speeds of up to 59 mph.
There are three main engine sizes in the Vespa range and all have single-cylinder, four-stroke engines. The 155 cc models produce slightly less than 13 horsepower, while the 278 cc machines produce about 21 horsepower because of their catalyzed engines.
Broadly speaking, the Vespa range can be split into three categories: the Vespa Primavera 50, Vespa Sprint 50, Vespa S 50 4V Sport SE, Vespa LX 50 4V and Vespa S 50 Sport SE can go up to around 40 mph; the Vespa Primavera 150, Vespa Sprint 150 ABS, Vespa LXV 150 IE, Vespa S 150 IE Sport SE, Vespa S 150 IE, Vespa LX 150 IE and Vespa 946 can go between 40 and 59 mph; and the Vespa GTS 300 IE Super Sport SE, Vespa GTS 300 IE Super, Vespa GTV 300 IE and Vespa GTS 300 IE can go up to around 80 mph. Vespa is an Italian brand that produces a large line of motorized scooters, most of which are road worthy.