The Ducati Monster is a standard, or naked bike, motorcycle designed by Miguel Angel Galluzziand produced by Ducati in Bologna, Italy, since 1993. In 2005, Monster sales accounted for over half of Ducati’s worldwide sales. Like most modern Ducati motorcycles, it has a 90° V-twin engine, called an L-twin by Ducati, with desmodromic valves, and tubular steel trellis frame, designed by Fabio Taglioni (1920–2001).
The Monster line has had numerous variations over the years, from entry level 400 cc (24 cu in) bikes up to top-of-the-line 160 hp (120 kW) multivalve, water-cooled superbike-engined versions, with as many as nine different Monster versions in a single model year. The Monster’s elemental simplicity has also made it a favorite platform for custom motorcycle builders, showcased at competitions like the Monster Challenge. Monsters eventually accounted for two-thirds or more of Ducati’s output