So... is Gekisou! Rubenkaiser finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Gekisou! Rubenkaiser follows a young race car driver's journey as they compete in races across the globe.
Inheriting a special race car from their father, the protagonist aims to prove their skill and honor their family legacy.
The series likely focuses on the challenges and rivalries encountered on the racing circuit, showcasing the protagonist's growth both as a driver and as a person.
Expect high-speed action, dramatic competitions, and personal struggles as the driver pushes themselves to the limit.