Before the hate mail starts flowing, Neckarsulmer Strickmaschinenfabrik produced the infamous Kettenkrad tank-bike thingy. Moving on. In 1955 NSU was the world's largest motorcycle producer. But, like Dutch truck maker DAF, they knew the real action was in 600cc microcars, and released an ugly, miserable ride with a non-synchronous "crash" gearbox in 1957. Not many cared. But, in 1961, NSU released the Corvair-inspired Prinz 4 and oh baby, did Volk start to take notice. The new car featured a highly precise air-cooled, two-cylinder mill loaded with motorcycle technology and mounted behind the rear axle. Make the jump to see a Prinz 4 attacking the 'Ring and learn a little more.