As an example, the ST235/80R16E can be found with three different load capacities at 80 psi, 3420”, 3500# and 3520# depending on the manufacturer.
Here is how the DOT has worded the regulation that allows that to happen: “If the maximum load rating for a particular tire size is shown in more than one of the publications described in S4, each tire of that size designation shall have a maximum load rating that is not less than the published maximum load rating, or if there are differing maximum load ratings for the same tire size designation, not less then the lowest published maximum load rating.”
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