Helmut Krackowizer knew almost every historical motorcycle in detail, knew the stories of rare motorcycles and the biographies of their racers, most of whom he had also met personally and were also among his friends, such as Sammy Miller [trial world champion], John Surtees automobile and motorcycle world champion, Walter Zeller, Luigi Taveri (multiple motorcycle world champion on Honda from Switzerland), Hans Haldemann, Georg "Schorsch" Meier (in 1939 Meier was the first non-British to win the 500 cc class, the so-called Senior TT, at the infamous Tourist Trophy on the Isle of Man), Alfred Neubauer, the legendary Mercedes-Benz race director, and many others from the motor racing scene. He was a member of the Rudge Enthusiasts Club in England.