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I measured a like new original 4:50X12 and it was 21.5" in diameter.
I measured a Coker BFG 4:50X12 when they first came out 30 years or so ago and they were 19.4" in diameter.
I run Carlisle USA trailer tires that look pretty good (Tony Smith cares them) 4:80X12 and they were 20.5" in diameter.
Tony has several lines of 12" tire both bias ply and radials.
I am looking at buying new tires for my Crosley Wagon and read someplace the original 4.50-12 bias plys were larger then even the 4.80-12s available today. The tire numbering is usually a direct measurement of the tire so not sure if this is true. Thus I am looking for someone with a low mileage Crosley or even an unused spare with a known original 4.50-12 still on it they could measure to figure out proper tire specifications. As we all know a slight change in tire dimension greatly alters the effective MPH of any vehicle and this is quite important to good drive ability and speed. Thanks for any help offered! Todd