I have a 2004 S430 MB with AMG package. I just put on a new set of Goodyear F1 Eagles. 265/45/zr18 on back and 245/40zr18 on front. Car specs 30 psi in front and 33psi in rear. Tire spec indicates max psi of 50
Use the Car’s specs, the tire Max psi is just that, the maximum pressure you can put in the tires.