factory tirerim size

   Don't know what you mean by "proof".   Both early and late literature shows the Super 77 Row Crop with 11x38" tires and Optional 12x38" tires.   Most were built with the lighter cast wheel part number (L 705 B) in wheel casting, with demountable rim.   Tractor could have been ordered with pressed steel wheels.   Power adjustable rear wheels became available in 1957, again 11x38" or 12x38" tires.

   Three wheel rims are shown in the parts book, wheels for 10x38", 11x38" & 12x38", however the 10" tire was not shown in the Super 77 literature.
 

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