I got something done (removed corrosion from an old Craftsman electric saw) so I tried two search strings. From the first*:
https://whyisthisinteresting.substac...-wheel-edition
It was like a combination of the two in the lower left, a solid center with fingers that curved into the gap between spokes.
From the second:
What's interesting is that the website
https://asktheman.xyz/ attributes the picture 'From ecomodder.com' but the URL is Pelican Parts. So somewhere on this site is a thread that contains this pic.
*This is an interesting article, about aero wheel covers going in and out of fashion
Quote:
An industrious person could likely then look back at the points in the last 100 years when energy efficiency and conservation were at the height of collective consciousness (1920s-30s, 1970s-80s, 1990s-00s, 2020-today) and find that the occurrence of aero wheel designs to emerge shortly after those crests, only to disappear again in the trenches of time between—where they move from a vision of the future, to a dominant style, to a passé look cast aside for something a bit flashier.
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And their wheel of the day:
