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35 psi, however since I used to work as a tire engineer for goodyear, i think my comments below are worth your interest:
To balance out some of the poor ride / slightly poorer traction that runflat tires have due to their stiff sidewalls, you can safely let the pressure down to 28psi or so.
Since the tires sidewall is already stiff as heck dont worry about losing much on handling by going to the lower pressure.