Checking Tire Pressure
When manufacturers make recommendations on tire pressures, their figures are based on cold tires. The best time to check tire pressure is after they’ve been resting overnight or at least for several hours. The ideal temperature to get the most accurate reading on tire pressure is about 70 degrees Fahrenheit. And the best place to do it is somewhere near sea level.
A low-cost tire pressure gauge may not be your friend. You get what you pay for and the cheap ones often are not calibrated accurately. The better bet is to invest in a self-calibrating, electronic digital gauge. These hand-held units are reportedly the most accurate.
Tire pressure facts:
• Severe heat and extreme cold impact tire pressure.
• Increase the temperature from 70 degrees F to 100 degrees F and tire pressure goes up. Driving even short distances increases it even more.
• In cold weather, tire pressure automatically drops. At around freezing, tire pressure will be at least a few pounds less, and when the temps hover closer to 0, even less.
• With less oxygen in the air, tire pressures change at high altitudes. For every 1,000 feet above sea level, you will see a corresponding increase in your tire pressure of about half a pound. As an example, take your rig up to 5000 feet and your tire gauge – which was accurate at sea level – will now show your tire pressure to be 2.5 psi too high.
Tire pressure tip:
• Changing out a tire? Be sure to check its pressure right away and perhaps a day later. Sometimes a bead sets slowly and the tire gets overinflated or it could have a small leak and be underinflated.
Got any tips or tricks on how you keep your rig’s tire pressure at the right level or when you check it? Share them here: