The Generation 1 continuity family is the biggest, oldest, and longest-running family in the Transformers canon. Its core is all of the fiction published under the original The Transformers franchise, which got off to a bifurcated start in 1984 with the Marvel comic and Sunbow cartoon, two distinct universes starring the same cast of characters. Alongside those two main continuities there sprang up a cluster of micro-continuities in the form of books, flyers, and more comics.
As the years went on, many subsequent franchises used strands of Generation 1 lore as the backstory of their own fiction, thus joining and extending the continuity family. Even when the main Transformers franchise is separate from Generation 1, oftentimes secondary "filler" franchises will keep the continuity going. It has also been a favorite with modern comic companies, who have been publishing a relatively steady stream of The Transformers-branded comics since 2003.
In Japan, TakaraTomy has not only contributed to the continuity family with unique series of its own, but it even published an "official timeline" that jammed Car Robots and the 2007 film into the Generation 1 multiverse. The inclusion of Car Robots is corroborated by Kiss Players fiction and timelines, but nothing else has touched upon the movie being part of the Generation 1 continuity family.
In-universe, this continuity is referred to as "Primax" in the TransTechs' universal stream designators.