Quote:
Originally Posted by Festus2
CW -
In the above link to safercar.gov, it states that you should inflate your tires to the pressure stated on the placard placed there by the manufacturer - not the cold pressure stamped on the tire. This "number" is good only for the OEM tires - is it not? If Keystone placed the placard there for D Load range tires at say 60psi, and you decided to put E range tires that have 80 psi stamped on the tire, then the placard would not be applicable for the new set of tires.
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It really depends on tire design. Tires of the same design have the same load capacity charts for like sized tires. In other words, a tire sized ST225/75R15D has a maximum load capacity of 2540# at 65 psi. The same tire with a LRE capacity will provide the same load capacity at 65 psi for either tire. Industry standards do not restrict increases in recommended tire pressures, but, they are very consistent in saying to NEVER use less tire pressure than recommended by the vehicle manufacturer. However, the rims must be able to support increased load capacity, air pressures or both.
CW
p.s. Tire manufacturers have no control over recommended tire pressures set by vehicle manufacturers. However, they do have control over who they sell their OEM tires to. Many ST tire manufacturers will advertise their tires as 100% capable of being aired to full sidewall pressures at all times. It is very unwise for any RV trailer owner to use less than what the tire manufacturer says is the best air pressure conditions for their tires - as long as it‘s above vehicle manufacturer recommendations.