The Smart Roadster and Roadster Coupé were introduced in 2003, based on a stretched platform of the Fortwo (full length is 3427 mm). The two variants are meant to be reminiscent of the British roadster of yore, such as the Triumph Spitfire or the MG MGB. Both the Roadster and Roadster Coupé are available with a removable Targa roof or an electrical Softtop. The Roadster is powered by 45 or 60 kW (61 or 82 PS) versions of the turbocharged 698CC 3-cylinder Suprex engine in the rear, which is engineered by Mercedes-Benz. The Roadster Coupé has only the more powerful 82 PS (60 kW; 81 hp) engine. A steering wheel with Formula 1-style gearpaddles, to control the semi-automatic sequential transmission, is optional. With weight as low as 790 kg (1,742 lb), it is meant to provide the emotion of driving a sports car at an affordable cost.
Source: Wikipedia, 2011.