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Originally Posted by TWK
"Tube frame" isn't even the correct terminology. What we are talking about is a "tubular space frame." By definition, a tubular superstructure on frame rails does not, and never has, qualified. Nor does a tubular structure attached to an underlying unibody structure. That describes most any race car structure.
In modern racing parlance, a "tube frame car" refers to one in which the suspension pick-ups of the original car are no longer associated with the original structure; in fact no part of the original structure is retained or needs to be. Examples are NASCAR Nationwide and Cup cars, and the Pontiacs and Mazdas competing in Grand Am. Historically, many of the IMSA GT cars were "tube frame" cars by those definitions. Rarely, a car is built by a manufacturer that is a tubular space frame in its original road-going form. BMW's M1 (1977-1980) was one.
Yelling "yes it is," doesn't make it so.
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OH MY, TWK, I think you brought a tear to my eye, bless you, bless you for such gearheadically correct rhetoric, bless you good sir!
Bob