Big wheels are all the rage in the world of bikes. Mercedes-Benz is now kicking off the new season with a "Twentyniner": the new fitness bike sports wheels with a diameter of 29 inches (including tyres). Greater traction, smoother running and enhanced riding stability are the merits of this upscale fitness bike. The high-end 2012 Mercedes-Benz Bike Selection additionally includes a full-suspension mountainbike, a comfortable trekking bike suitable for everyday use and a high-end carbon-fibre racing bike.