Quote:
Originally Posted by Campitupcouger
I just bought a new 2021 GMC Sierra 6.2 L X31 Off Road with GoodYear TrailRunner AT 275 / 60R20 for tires. The Max Cold PSI for these tires is 51 PSI. When towing my Keystone Cougar TT fully loaded, should I air up to the Max PSI Cold? In general, I have seen many opinions mostly land on setting them to the Max PSI. The Trailer Tires are always at the Max PSI.
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Without a full description this is how I see it:
Your tires are ISO Euro Metric. They are (SL) and have their own load inflation chart. Do not use Euro XL or USA P inflation charts. Look at the service description on the tire sidewall. The P tires will have the lowest Service Description, maybe 114 the SL ties are always a little higher starting at 115. The XL tires may be 116.
Depending on the tire manufacturer and the purpose of the tire the load inflation charts may differ with maximum load capacity topping out at somewhere near 36 - 42 PSI. The maximum sidewall pressure may be 50/51 PSI. From the 36/42 PSI to the 51 PSI there is no increase in load capacity, just tire stiffness.
Here is an inflation chart for you to ponder.
https://tirepressure.com/metric-tire...nflation-table
Here are what I suspect are the specs for your tires.
https://www.tirerack.com/tires/Spec....TrailRunner+AT