Smart has unveiled its next generation of cars that will include a new Fortwo and Forfour.
The new Forfour is a joint development with Renault, sharing technology with the forthcoming Twingo.
Power comes from two new three-cylinder engine with outputs of 60hp, 71hp and 90hp, while gearbox options are a five-speed manual transmission or the Twinamic automatic dual clutch transmission.
The cars will launch in November with UK sales expected to begin in 2015.
"As Europe's youngest car brand, Smart enjoys global success today," said Smart boss Annette Winkler. "No-one combines functionality and emotion as well as we do, as the inventors of individual urban mobility.
"The new Smart Fortwo and Forfour adopt the proven concept while offering more of just about everything – more space, more colour, more equipment and even more fun in the city."
Jörg Prigl, head of compact cars at Mercedes-Benz said: "In the planning phase we were clear that we wanted to retain the rear engine for the new Smart, so as to continue to exploit the vehicles' strengths to the full in the city."
"On this basis, we then developed the new Fortwo and Forfour together with our partner, Renault."
Markus Riedel, head of development at Smart, added: "Despite increased safety requirements, we have managed to retain the Smart Fortwo's unique length of just 2.69 metres.
"It shares its architecture with the new Forfour. We have tailored both of the vehicles to the needs of modern-day city traffic. My team is particularly proud of the turning circle, which sets a brand new benchmark at just 6.95 metres for the Fortwo."
The new model will feature some hi-tech safety equipment, with standard crosswind assist, as well as optional forward collision warning and optional lane keeping assist.
There will be three equipment grades, Passion, Prime and Proxy, and more information on UK prices and specification will be made available closer to the car's launch.