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Clasen finished his first International Six Day Trials in 1962 which was held in Garmisch Partenkirchen, Germany. Clasen, a privateer, campaigned a DKW RT175, and finished only 25 seconds behind Czechoslovakian ace Zdenek Polanka. This finish brought Clasen much recognition as an up-and-coming rider, and earned him a position as a Hercules factory rider. After several successful racing seasons in Germany, Clasen emigrated to Canada in 1967. In Canada, he remained active in the sport of Enduro, also racing in motocross and hare scrambles, while becoming a successful motorcycle Importer and dealer. During the 1971 ISDT, Clasen won the first ever Gold Medal for Canada. This feat earned him an invitation from the Canadian Prime Minister, by whom he was recognized for his Gold Medal effort.
Clasen has participated in 7 ISDT's (1962, 1971, 1972, 1973, 1976, 1989, and 1994), and has won the Canadian Off Road National Championship 14 times. Clasen won his final Canadian National Championship in 2000, at the age of 65. Today, at over 80 years of age, Clasen is actively involved with "Vintage" motorcycle off-road racing. Clasen participates in racing events in Europe, Canada and the United States.
On October 27, 2007, Clasen was inducted into the Canadian Motorcycle Hall of Fame. Clasens' induction is significant as he is the first German Canadian "offroad" racer to be so recognized.
- Canadian Motorcycle Association/ ADAC (Allgemeiner Deutscher Automobil Club),/ Canadian Hall of Fame/Active off-road racers/