NSU Sportmax streamlined motorcycle, 250 cc class winner from the 1955 Grand Prix period Within the fifties, streamlining began to play a growing component in the event of racing motorcycles and also the "dustbin fairing" held out the opportunity of radical changes to motorcycle design. Other search engines like google https://groups.google.com/g/motogiabao/c/x9wCeKvJOOA