Before landing on DiC, Saban Entertainment, Funimation Productions (who went on to license the Japanese shows in 2015) and 4Kids Entertainment were considered to license the show from Speed Racer Enterprises, but they all turned down by SRE.
When Nickelodeon decided to end their block Slam! where Speed Racer X is aired, DiC attempted to sue Speed Racer's American rights owner Speed Racer Enterprises (SRE), but SRE counterattacked them, ending their agreement to the American dub.