|Born||6 June 1928
|Died||October 1959 (aged 31)|
|Active years||1950 - 1959|
|Teams||Matchless, BSA, Greeves|
Stonebridge began riding for the Matchless scrambles team in 1950, winning a gold medal in that year's International Six Days Trial. In 1952 and 1954, he was a member of the British teams that won the Motocross des Nations. In 1954, he joined the BSA factory team, helping develop the two-stroke, BSA Bantam scrambler. Stonebridge then moved to the Greeves racing team in 1957, becoming the company Competitions Manager and Development Engineer. He competed in the 1959 F.I.M. 250cc European Motocross Championship, finishing the year in second place behind Rolf Tibblin. Stonebridge was killed in a road accident in October 1959.
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