Career
He was eliminated in the semifinals of the K-1 1000 m event at the 1976 Summer Olympics in Montreal. Four years later in Moscow, Classens was eliminated in the semifinals of the K-1 500 m and the repechages of the K-1 1000 m events.
He was eliminated in the semifinals of the K-1 1000 m event at the 1976 Summer Olympics in Montreal. Four years later in Moscow, Classens was eliminated in the semifinals of the K-1 500 m and the repechages of the K-1 1000 m events.