Derbi is a manufacturer of motorcycles, scooters, mopeds and recreational all-terrain vehicles produced by Nacional Motor S.A.U., a Spanish subsidiary of Piaggio & Co. SpA. Derbi's origins began with a little bicycle workshop in the village of Mollet near Barcelona, founded in 1922 by Simon Rabasa i Singla. The focus remained the repair and hire of bicycles until May 1944 when Singla formed a limited liability company named Bicicletas Rabasa with the aim of moving into manufacturing bicycles. The venture proved very successful and in 1946, supported by its profits, work began on a motorised version. More moped than motorcycle, this first model, the 48cc SRS included plunger rear suspension, and a motorcycle type gas tank and exhaust system. The SRS proved so successful it prompted a change in the companies direction, and on November 7, 1950, the company changed its name to the Nacional Motor SA. Just prior to this, at that summer's Barcelona Trade Fair, the company unveiled its first real motorcycle, the Derbi 250. Derbi successfully competed in Grand Prix motorcycle racing, winning 50cc world championships in 1969, 1970 and 1972. When the 50cc class was increased to an 80cc displacement in 1984, Derbi would claim four consecutive world championships between 1986 and 1989, before the class was discontinued in Grand Prix competition. The firm also experienced racing success in 125cc Grand Prix competitions, winning world championships in 1971, 1972, 1988, 2008 and 2010. The Derbi RSA 125 earned 405 points in the constructor's championship in the 125cc class. The 405 points in 2010 are second only to Aprilia which earned 410 points in 2007.[citation needed] [edit]Modern history A 2005 model Derbi GP Scooter Unlike Ossa, Bultaco, and Montesa, Derbi successfully met the challenges that followed the Spanish transition to democracy and Spain's entry into the European Community. Simeo Rabasa i Signla died in 1988 but the company remained independent until 2001, when it was bought out by the Piaggio group. [edit]The Derbi name The name Derbi is an acknowledgement of the company's history and is an acronym for DERivados de BIcicletas (derivatives of bicycles). The basic motorcycle swingarm is a rectangle, with one short side connected to the motorcycle's frame with bearings so that it can pivot. The other short side is the rear axle around which the rear wheel turns. The long sides are connected to the motorcycle's frame or rear sub-frame with one or two shocks with coil-over springs. In production motorcycles, swingarms are not exactly rectangular, but their function can be more easily understood by thinking of them as such. Moto Guzzi's CA.R.C. When a swingarm is present on only one side of the motorcycle, this is known as a single-sided swingarm. Notable examples include the Honda VFR800 and the BMW R- and K-series. Single-sided swingarms make rear-wheel removal easier, though they generally increase the unsprung weight of the rear suspension. This is due to the additional material required to give identical torsional rigidity to a conventional (two-sided) swingarm setup. For this reason sports bikes are rarely seen using the setup. Notable exclusions are the Ducati 916 which was intended to be taken endurance racing, the MV Agusta f4 which has a hollow interior for reducing weight (a magnesium version is also available), and the Ducati 1098, which was given a single sided swingarm purely for styling reasons.