[6] He started riding in Great Britain during the 1951 Speedway National League, when he joined the Harringay Racers.

[5] He soon established himself as a leading rider, recording exceptional averages for New Cross Rangers and then Bristol Bulldogs during the 1953 Speedway National League season.

He returned to British speedway in 1960 and would ride until the end of the 1975 season, regularly topping the team averages.

He died in Ipswich at the age of 91, after contracting COVID-19; he had previously been treated for laryngeal cancer.

Nygren qualified tenth of the ten starters, and had to retire after just six laps with a gearbox failure.