2013年の全日本ロードレース最終戦MFJグランプリを最後に、ST1000クラスの榎戸育寛選手（SDG Motor Sports RT HARC-PRO.）が現役を退くことを発表した。 一番の思い出は2016年の最終戦・鈴鹿。ST600クラスでランキング6位でレースに臨むと、優勝して大逆転チャンピオンを決めたことと語っている。 現役を引退する理由などはSDG MOTORSPORTS RT 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