The maximum pressure of the tire is not a verry meaningful thing. they have to put it on the tyre by law in some countries.
What you need for the advice-pressure is the reference-pressure.
And that is for normal car tires in europe 36 psi ( 250kPa) and for XL tyres 290kPa.
LT tires or C-tires 450kPa ( 65 psi).
But if you realy want to know it you can also look on the other side-wall of the tire. or one of the other tires. If you read "at xxx psi ( or kPa) " then that always is the reference pressure wich you can use in spreadsheet I made for recalculating tire pressure with use of the formule of the European ETRTO, wich gives the highest so savest advices.
http://cid-a526e0eee092e6dc.skydrive...0tyre-pressure
from there you can navigate my whole public map of hotmail, for more spreadsheets.