As always when discussing CMP Tires, there are variations of actual dimensions by maker within the same nominal size.
Based on the AEDB Design Record, 10.50-16 tire diameter ranged from 37.4 to 38.2 inches and 10.50-20 ranged from 41.3 to 42.3 inches. All diameters given are for tires that are inflated on rims but not mounted on vehicles as the reduction from "free" diameter to "loaded radius" varies depending on the weight (vehicle plus load) the tire is carrying.
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