Career
His best Olympic finish was 5th at the 1976 Winter Olympics in Innsbruck in the 50 km. In 1975, he was awarded (shared with Oddvar Brå and Ivar Formo).
cross-country skier athletics competitor
His best Olympic finish was 5th at the 1976 Winter Olympics in Innsbruck in the 50 km. In 1975, he was awarded (shared with Oddvar Brå and Ivar Formo).
He won several medals at the FIS Nordic World Ski Championships, including golds in the 50 km and the 4 x 10 km relay (both in 1974). Silvers in the 30 km (1970), 4 x 10 km relay (1970), and 15 km (1974). And a bronze in the 50 km (1970). Grimmer also won the Holmenkollen ski festival at 50 km twice (1970-1971).