The overall width of the car with the sheetmetal - ie the absolute width of the car for all 1940 Chevrolet sedans, and coupes is 71 21/32" wide.
The rear tire dimension for all 1940 Chevy sedans and coupes is 59". This is a center to center dimension. It is measured from the center of 1 rear tire to the center of the other rear tire.
The front tire dimension for all 1940 Chevrolet sedans and coupes is 57 21/32". The is a center to center dimension. It is measured from the center of 1 front tire to the center of the other front tire.
This information is from official 1940 Chevrolet literature.
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