In the beginning, it was just the Benelli Garage, which repaired cars and motorcycles, but was already able to produce all of the spare parts needed for repairs. In 1920 the company built its first complete engine in-house, a single-cylinder two-stroke 75 cc model, immediately adapted to a bicycle frame. A year later in 1921, Benelli built its first motorcycle, using their own engine which had by then become a 98 cc model.
Two years after that, using a version specially designed for competitions, Tonino "the terrible" took to the track. He displayed an extraordinary natural talent as a rider and embarked on a very successful career which confirmed the company's exceptional capacity for development and production. Riding a Benelli 175, Tonino Benelli won four Italian championship titles in five years: in 1927, 1928 and 1930 with the single overhead camshaft (SOHC) version, and in 1931 with the double overhead camshaft (DOHC) version. Unfortunately, a bad crash during a race in 1932 cut short his brilliant career and on 27 September 1937 Tonino died following a "silly" road accident.
As World War II loomed, the Benelli company debuted their four-cylinder supercharged 250cc racing bike. This was intended to compete in the 1940 season, building on Benelli's success in the 1939 Isle of Man TT Lightweight 250 cc race. With the start of the war, the Benelli Four was limited to competition in a handful of Italian domestic races.
Wartime destruction caused Benelli to remain out of production until 1949. When production resumed, designs were still largely based on those of the pre-war period. During 1949, Giuseppe Benelli left the family concern to found the Motobi marque.
By 1951 Benelli was offering a range consisting of 98cc and 125cc lightweights (the Leoncino or lion cub) and 350cc and 500cc singles. The Leoncino was available in both two-stroke and four-stroke forms. The need for cheap transport in post-war Italy meant that these lightweight models became immensely successful . Similar models were offered by Moto Guzzi, Ducati and Laverda, and the same economic conditions led to the growth in popularity of Vespa and Lambretta scooters.
In 1962, Motobi was acquired by Benelli, and the combined company produced around 300 motorcycles a day and had 550 employees. Motobi designs continued in production under the Benelli name.
In 1939, Ted Mellors was victorious, racing in the saddle of the Benelli 250. In 1950, Dario Ambrosini also won the 1950 Isle of Man TT, repeating Mellors’ success and consecrating his title by winning both the Italian and the World Championships.
In the 1960s two extraordinary riders competed in the races: Tarquinio Provini, who won the Italian Championship with the 250 in 1965 and Renzo Pasolini who won the Championship with the 250 as well as the 350 in 1968 and 1969. In 1969, the enormous effort invested in competition was rewarded with the 250 world title thanks to Kel Carruthers, who also again won the Tourist Trophy in the same year. It would also mark the last world championship for a four-stroke motorcycle until the advent of the modern MotoGP era in 2003. Many of the most famous riders in the history of motorcycling raced with Benelli bikes, from Mike Hailwood to Jarno Saarinen.
In 1973 Benelli was acquired by Argentinian industrialist Alejandro de Tomaso together with its competitor Moto Guzzi which lead to the development of new models featuring multi-cylinder engines, such as the "350 Quattro" and the "500 Quattro", and of the incredible 750 Sei powered by a huge six-cylinder in-line engine, which put the firm briefly ahead of the Japanese competition. Although technically advanced, Benelli motorcycles of the 1980s were plagued by problems, and the production was finally stopped in 1988 when the company was merged into Moto Guzzi to create "Guzzi Benelli Moto S.p.A.", and the production plants in Pesaro were sold.
In 1995 revival of the brand with the glorious history became a real possibility when Andrea Merloni took charge. Results were fast in coming with the launch of the Tornado 900 Tre super sport bike in 2002 and the current launch of the TNT, the roadster. Former Australian Superbike champion Peter Goddard signed with Benelli in 2001 to accelerate the development of the Tornado Tre 900.
Benelli is now part of motor Group Qianjiang, which is a corporation located in southeast China at Wenling. Benelli Q.J. is located in Pesaro where the previous proprietors based the facilities, keeping the whole workforce previously working at Benelli s.p.a.