Frankfurt - CCM News. At the 2011 Frankfurt Auto Show - the IAA 2011 - Mercedes-Benz celebrated more world premieres than ever before. Center stage was the second generation B-Class with an entirely re-designed body, reflecting the impressive dynamic performance of the all new four cylinder engine with direct injection and turbocharging as well as the new diesel engine. The new design makes the B-Class the most spacious car in its class. Equipped with state of the art assist systems, radar based collision warning system and PRE-SAFE the new B-Class sets a new standard for the compact car segment.