6" wide 1940 wheels? Are you sure? If they really are, they have to be rare commercial wheels, and are probably very valuable.
My guess? The original poster was measuring the very outside width.
Tire size 6.00 x 16 is my guess
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1940 Ford Deluxe 16 Inch Wheel
Ain't that pretty? It just so happens that that particular wheel/tire is the original spare out of a '41, although it is the same wheel as a '40. Note the "FORD" script on tire at about one o'clock! Coop
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Tire size 6.00 x 16 is my guess
The way I understood it was the 40 wheel was 4" wide, with the drop center having square sides on front and back. But in 41 they were 4" with a square drop on the front and a taper on the back.