[2] Tibblin was part of a contingent of Swedish motorcyclists including; Bill Nilsson, Sten Lundin and Torsten Hallman who dominated the sport of motocross in the early 1960s.

[9] He returned to compete in the East German Grand Prix, but was forced to abandon the race as his eye injury made it difficult for him to focus.

[9][11] He clinched the European Championship at the 250cc Luxembourg Grand Prix by lapping the entire field with the exception of second placed Brian Stonebridge (Greeves}.

[5] The International Six Days Trial is a form of off-road motorcycle Olympics that is the oldest annual competition sanctioned by the FIM, dating back to 1913.

[6][14] However, he returned in late August when he was the top individual points scorer at the 1961 Motocross des Nations event, leading the Swedish team to victory.

[2][15] Tibblin returned to form in the 1962 500cc World Championship, winning five of the ten Grand Prix races to claim his first premier class title by four points over second placed Gunnar Johansson.

[2][16] Sweden continued to dominate international motocross with Swedish riders taking the top five places in the 500cc Class final standings for 1962.

[17] Tibblin repeated his performance at the 1962 Motocross des Nations event, where he led the Swedish team to victory as the top individual points scorer.

[20] However, a significant moment in motocross history occurred during the 1963 season when ČZ factory rider Vlastimil Valek rode a 263cc two-stroke motorcycle to defeat Tibblin in the first moto of the 500cc Czechoslovakian Grand Prix.

[2] He won the Italian and German Grand Prix races, but was unable to make up lost ground and dropped to third place in the final standings behind Smith and his ČZ teammate, Paul Friedrichs.

In the spring of 1967, Tibblin suffered a broken arm while competing in a pre-season race in Sint Anthonis, Holland, forcing him to retire from World Championship competition at the age of 30.

[5] Seeking new challenges, Tibblin moved his family to the United States in 1971 where he operated the "Husqvarna International Training Center"; a motocross school in Carlsbad, California during the mid-1970s as the sport enjoyed a boom in popularity.