Allis Chalmers WD 38 rear tires

Does anyone know for sure that there was a 38" rear tire option for the WD? Some of the places we pull require a 15.5x38 is max tire size and don't allow the 16.9x28 we have on our's....so I figure we'll just put a 38" set on, but it also needs to be a standard equipment option for other places we go. Needs to be more standardized rules, anyway, any help???
 
At the pull I help run to have anything other than a 28" wheel on that tractor you would have to prove with a parts manual it was a factory option. This pull is strictly out of field class of tractors and all I see with the larger wheels fit the hot rod class. The larger wheels are esencialy reducing power so much that it would be like running in 3rd gear and pull rulls are low gear only. And only standard field power in the engine. So with the 38" without having different gears in transmission you would not have enough power to start the sled.
 
The factory 38" high-crop wheels were pretty narrow, maybe only 9 or 10" wide. And the gearing would be a problem.
 
Parts book shows the option to be a 9x38 tire with a different wheel center. It is not a Power Shift rim.
 
a 16.9x28 tire is smaller than a 15.5x38. We had a pull at the Pa Farm Complex in March and the rule was max 15.5x 38 and they said I could pull with 16.9x28 If your pulling with either you had better have had motor work. I run 2nd gear with 14.9x28's on mine and 4500 lb class takes it out of power in 2nd. 16.9x28 you will have to use 1st gear. Allis made a 38 size on it high crop model. One of the pulls told the driver if he wanted to pull in the stock class then put the high crop wide front on. Its in the wd and wd45 operators manual.
 

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