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Wouldn't a worn ring with smaller annulus (heh - I had to google that) from wear, exert less cylinder wall pressure/allow greater cylinder wall gap? And additionally, getting pretty granular here but the ring faces are usually tapered slightly to scrape oil and if that face is worn square I'd think it would not fulfill its function optimally as a compression ring (I think oil control rings start square).
But my main question is the overall wear one where I think I disagree with you on the annulus dimension unless I missed something.
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84 944, 87 Vanagon, 88 Mitsubishi Van Wagon, 88 Supra Targa, 1990 Audi 90 20V Quattro sedan, 1992 Lexus LS400, 1993 LandCruiser, 1997 LandCruiser, 2017 Subaru Outback.
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