Originally Posted by JerryR
I am replacing the tires on my small (12-14 ft, depending on how you measure) travel trailer. I plan to buy Good Year Endurance ST205/75R14, load range D to replace the brand X Chinese ST205/75R14, load range C.
Vehicle manufacturer says to inflate to 50 psi. Sidewall on existing tires have 50 psi listed as max.
The replacement Good Year tires have max of 65 psi on sidewall.
I see that the opening post on this thread says use the sidewall pressure. But I have always gone with the vehicle maker's suggestions which are often lower than the max tire rating. For example, my F-250 wants 65 psi in front and 80 in rear.
Do I use the 65 max on the tire or with the vehicle manufacturer's 50 psi?
Because your replacement tires are of the same designated size as the Original Equipment tires, the 50 PSI is the correct cold inflation pressure. Because the new tires have a higher load capacity as the result of the LRD, you have options that are from 50 PSI to 65 PSI. To use those options you need to confirm that the wheels and their valve stems are pressure rated/load rated for the higher pressure rating/loading for the LRD tires.
There is a standard recommendation for at least 10% in load capacity reserves above the vehicle certified GAWRs. Most, including me, will recommend 15%, if possible with the replacements.