Quote:
Originally Posted by hlh1
I should have researched more before posting. My tires show a max PSI of 51. So, I'll set the cold at 35 psi for max load and then not worry too much until they get towards 51 psi.
When last towing the tires got up to 43 psi in air temps of 97 degrees. My infrared temp reader showed the tires at 130 degrees. The Carlisle trailer tires went from 63 psi to 70 psi and only showed 120 degrees.
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So your Standard load P-tires went from 35 to 43 psi. Is 8 psi rising x 10.5 degrF= 84 degr hotter then say 60 degrF, when you filled them cold at 35 psi.
Is 144 degrF .in the tire.
My post given 39 psi if driving about 50/55mph at 100 degr. Temp in tire 110 to 115 degrF. When 100degrF 20 degr hotter, so 130/135, gives 41 psi.
So or, you drove a bit faster then 50/55mph.
Or external factor like sunshine on tire , but most likely noting wrong
Or some overloading, because tires capacity is with comfortable reserve.
Sl P tires can carry maxload up to 99mph with 35 psi.
Where all the tires that 43psi, or only rear.