The tire should be inflated to near the limit of the tire. That is, if the limit on the tire is 44 PSI then you should get it up to 42 or 43 PSI. The recommended tire pressure on the driver’s door (usually around 30 PSI) should be ignored.

31.9 psi

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The rule of thumb (best understood as our American counterparts put it) is that tire pressure will go up approximately one pound per square inch (PSI) for every 10 Fahrenheit increase in temperature.

42 should be fine. Anything 17″ or larger with a with a 45% or less aspect ratio should use between 39-49 psi. 42 should be fine. Anything 17″ or larger with a with a 45% or less aspect ratio should use between 39-49 psi.

Overinflated Tires Wear Out Your Tires Faster & Unevenly When your tires have too much air it causes the center of the tread to bow out and wear first. Because of this you will need new tires more often and have a less than comfortable ride.

Analog tire pressure gauges were the standard for many years, but advancements in digital technology have improved on that standard. Analog dial gauges are about as accurate as the quality pencil type gauges. Buying a cheap digital gauge would be the same as buying a cheap pencil type gauge.

Digital gauges

While they do cost a bit more than a conventional tire gauge, digital tire gauges typically give a more accurate reading and are easier to use. All you have to do is turn on the gauge and place it on the valve stem to get a PSI reading.