Summer on Three Wheels is the story of the shy outsider Flake, who not only suffers because his parents named him after the stuttering keyboardist of a famous rock band. He also absolutely fails to confess his love to the girl he secretly yearns for and to assert himself against his rival. So Flake first makes the wrong decisions - and then to the drug dealer Kim and the embittered wheelchair user Philipp. A special kind of tour de force develops from this encounter: a road movie that leads in a Piaggio moped car at 45 km/h from the top of Stuttgart to Lake Constance.