Freddie Spencer
Freddie Spencer won the 500cc world championship in 1983 at just 21 years old, then achieved something no rider before or since has repeated — winning both the 250cc and 500cc world titles in the same season, in 1985, on machinery from the same manufacturer.
Freddie Spencer began racing motorcycles as a young child in Louisiana and rose through American short-track and road racing before Honda signed him for their Grand Prix effort while still a teenager, a rapid rise that culminated in the 500cc world title in 1983 at just 21 years old.
His 1985 season remains one of the most remarkable in the sport's history: Spencer contested both the 250cc and 500cc world championships simultaneously for Honda and won both outright, a combination of skill and physical endurance that no rider before or since has repeated.
The toll of that season caught up with him quickly — chronic wrist and tendon problems curtailed his results for the remainder of the 1980s, and he retired from full-time competition in 1988 still only 26 years old, later building a second career as a respected riding instructor in the United States.
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In 1985, Spencer contested both classes for Honda across a single season and won both championships outright — a physically and logistically demanding feat (racing two different classes of motorcycle at the same events) that no other rider in the sport's history has matched.
Spencer won the 1983 500cc title at 21, edging out Kenny Roberts in one of the closest championship battles of the decade, ending Roberts's run of three consecutive titles.
After his extraordinary 1985 season, Spencer's results declined sharply due to persistent wrist problems, widely attributed at the time to the physical toll of the dual-class campaign; he never again finished on top of the championship standings, a steep and much-discussed fall from a rider once considered the sport's brightest talent.
After retiring from Grand Prix racing, Spencer founded the Freddie Spencer High Performance Riding School, training road-racing and street-riding students at circuits across the US, passing on technique developed over his own career.
Unlike many of his European-based rivals, Spencer built his career from and ultimately returned to Shreveport, the same Louisiana city where he grew up racing motocross and short-track machines as a child.