Bitter was founded in 1973 by Erich Bitter, a German entrepreneur and automotive designer, as a constructor of exclusive, hand-assembled sports cars and luxury vehicles. The company remained production-focused but extremely low-volume, creating perhaps a few hundred vehicles during its 24-year history. Bitter vehicles were built in Germany using selected components and bespoke construction methods, each automobile essentially custom-assembled for discerning customers seeking exclusivity and distinctive performance.

Bitter vehicles are characterized by distinctive styling, powerful performance, and extreme exclusivity, with many models featuring unconventional design elements and modified mechanical components. The brand's philosophy emphasized creating memorable, individual vehicles rather than pursuing conventional market segments. Bitter produced sports cars and high-performance luxury vehicles that attracted customers seeking something distinctly different from mainstream manufacturers, though production volumes meant few examples survive in any condition.

Bitter repair documentation covers the various powertrains and systems incorporated into these hand-assembled vehicles, which often featured modified engines, custom electrical systems, and unique chassis configurations. Available technical information includes wiring diagrams and mechanical specifications for models produced during the company's operational years, though documentation is often limited due to the small production volumes and custom nature of each vehicle.

Bitter manuals serve the very small community of owners and collectors maintaining these rare German automobiles. Original factory documentation becomes extraordinarily valuable for these exclusive vehicles, as contemporary technical knowledge is scarce and each car may possess unique mechanical characteristics based on its period of construction and specific customer requirements.