The PX was introduced by Vespa in 1977.
The PX was first produced with either a 125cc or 200cc single cylinder air-cooled 2-stroke engine. 125cc versions of the PX were sold as the Vespa P125X until 1982 when the 125cc version was given electronic ignition and renamed the PX125. Between 1981 and 1986 Vespa produced a version of the PX with an 80cc engine. Vespa ceased production of the PX in 2007 until it was reintroduced in 2010 now conforming to Euro 3 emissions.