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First, I’ll have to ask this question. What size Sailun tires have you installed?
The inflation pressure on the tire sidewall IS NOT a recommendation. It’s the amount of cold inflation pressure necessary for the tire to provide its maximum load capacity. That maximum load capacity is also shown on the tire sidewall.
In accordance with tire industry standards, replacement tires MUST provide a load capacity equal to or greater than the Original Equipment tires provided.
If you are replacing ST235/80R16 LRE tires with ST235/80R16 LRG tires they are both the same designated size. The only major difference is the LRG will provide much more load capacity. The correct inflation pressure for them will start at 80 PSI with optional increases all the way to 110 PSI. A tire load inflation chart for that designated size works at all load range levels or in increments in between load ranges. IMO you’re wasting your money if you do not provide at least 15% in load capacity reserves above the vehicle certified GAWR.
The ST235/85R16 is a “plus sized” tire when used to replace a ST235/80R16 tire . A load inflation chart for that designated size will be needed to establish a new recommended cold inflation pressure as a starting point. Once established, you can then figure-out what PSI is needed to gain the 15% in load capacity reserves.
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