The large B-series use the same size, 12.4-16, for both Ag and Industrial tires.
An easy way to get a close measurement to overall width is to take the 'tread' measurement posted in the specs and add the width of one tire. For example, with the
B2320 on Ag tires, the tread is (35.5) + tire width (9.5) = 45"
For the Industrial tires, it would be 35.5+12 = 47.5" (this may not be exact, but it will be close)
This formula is also nice to figure the different widths of tractors with multiple rear tread settings. Like the
B2320 narrow which can be set from 35.5 to 37.5" overall width, IIRC it can go even wider if you flip the rear hubs.