Originally Posted by jadatis
This advice is for 18 degr C/65 degr F cold measured pressure , so measured when inside tire temperature = outside tire temperature at that 65 dgr F.
I don't understand this reference to "65F cold measured pressure" Is this some reference to a "standard laboratory conditions"?
Some people confuse "Ambient Temperature" which is the temperature of the outside air, with the theoretical "laboratory Standard" for doing chemical research.
As you know, or should know, tire pressure is set when the tire is at Ambient. This means not heated from being driven on for the previous few hours or being heated from being warmed by direct sunlight.
There is no adjustment for a difference between the actual Ambient temperature to some theoretical laboratory conditions.
I write a blog on RV tire application and safety. RVTireSafety.com
Also give seminars on tires at RV events across the US. 40 years experience as tire design & quality engineer for major tire mfg. Freelander 23QB on Chevy chassis is my RV