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Since the 12.5x20 is essentially the same diameter as the 9.00x20 (actually smaller) you will not increase road speed with these tires. Similarly, the 14.5x20 is the same diameter as the 11.00x20 (just wider and usually a radial).
Sizes
See if these help. Overall diameters (may vary by brand, type, or condition)
12.5x20 - 40.7"
9.00x20 - 40.9"
14.5x20 - 43.4"
11.00x20 - 43.5"
12.00x20 - 44.5"
395/85R20 - 46.7"
For even tire sizes (11.00, 14.00, 16.00) a quick rule of thumb is to double the number and then add 20" for...
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