Born on 20 November 1931 in Stockholm, Sweden, he first appears in the 500cc European Motocross Championship standings in the late 50s. He was riding in a time when Swedish riders were dominating the 500cc class. In his first year he finished in the 3rd place, two points behind Champion John Draper and one point behind his fellow countryman Bill Nilsson, riding a BSA, with two wins (Italy and the Netherlands). After a 4th place in the 56 Championship, he switched from BSA to Monark, which had a good racing bike to offer. But in 57 it was the turn of Bill Nilsson to get the title (Lundin was 3rd). Finally in 1959 he clinched his first World title in the 500cc Motocross Championship, and repeated the fact in 1961 on the same bike renamed Lito. He was second in 1958, 1960 and 1963, and third in 1962 and 1964. He also achieved a total of 22 race wins.
Sten Lundin was also a member of the Swedish team which won the Motocross des Nations in 1955 – his first year at top level (with Bill Nilsson and Lars Gustavsson). He was part the “Golden Era of Sweden” (fifties and sixties) when Swedish riders were frequently winning against British and Belgian riders at the top levels of Motocross (500cc and 250cc).
In more recent years he used to attend regularly vintage motocross events
All the members of the FIM present their sincere condolences to his family and friends.