Re: 21 inch wheels on a 1931
Depending on the tire selected, the outside diameter of the wheel/tire might not be any different between a 28/29 and 30/31 wheel.
21 inch tires range from 29.75 to 30.79 outside diameter and 19 inch range from 28.9 to 30.5. . Even going from the smallest 19 to the tallest 21 would net less than 1 inch in vehicle height, and the difference in speed would be within the margin of error in your speedometer. The difference in top speed would be in the area of 1.5 mph.
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