It is extremely rare to find a wheel stamped with a psi rating .
Some folks look at the wheel charts which say 1820 # load rating at 65 psi and think that is a psi limit .
actually what the chart is saying is that the tires need to be inflated to 65 psi to get that load rating .
that is why the wheels do not have a psi limit stamped on them , because there is not really a psi limit .
several posters to include capri racer , sprinkler man , low suv and gmw photos discussed this in depth a few months ago .
Steel wheels are strong enough to support a rated load and that rated load is a tenfold issue relative to the psi limit .