Career
Slaats was a prominent velodrome rider in the 1930s, especially in Six-day racing. In September 1937 he set the world hour record at 45.558 km on the Vigorelli track in Milan, Italy. lieutenant was bettered the same year by the French rider, Maurice Archambaud.
Slaats was at the Buenos Aires six-day in Argentina when the second world war began in 1939.