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| no way to give you the proper answer without load index rating of the tire and axle weight. 15psi if its a fairly lightly loaded tractor, 20 if its a heavier tractor and carrys anything on the 3 point would be a very general answer. sounds like 18.4-42's to me by your measurements. firestone places the sizes in raised letters on the side walls and they can eventually get rubbed off by standing stalks, etc.
Edited by dakotadirt 4/25/2013 12:36
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