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Discussion Starter · #1 ·
Myth or Fact: The pressure listed on the tire sidewall indicates the recommended pressure?

Myth or Fact: Tire pressure does not need to be regularly checked for vehicles equipped with TPMS?

When it comes to tires, there is a lot of misinformation out there. Check out our write-up linked below where we dismiss some of the common myths surrounding tires and tire safety.


 

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The "Tire Air Pressure" article is misleading regarding the conditions when the tire pressure is checked. It states: " As a general rule, you should perform an air pressure check every other time you fill up at the gas station or at least once a month."

The tires should be at placard pressure when checked during the coolest part of the day after the tires have sat for several hours (i.e. are at ambient temperature).
- If you've just come off the freeway on a hot afternoon to gas up, it would be correct for the pressure to be 5 or more psi above placard.
- Similarly, if checking pressure in a 60 F garage when the day's low is 20 F, the correct pressure would be 4 psi above placard, allowing for a 1 psi rise for every 10 F.
 

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Discussion Starter · #4 ·
You're correct, marty1 in saying that tire pressure fluctuates with temperature and while under operation; this is known as "hot" pressure and is to be expected. "Cold" is defined as in the morning before the day's ambient temperature, sun's radiant heat or the heat generated while under operation causing the tire pressure to temporarily increase, or become "hot".

The recommended cold pressure for the vehicle is determined from the original equipment tires and pressure indicated on the vehicles placard and adjustments will likely be needed if filling with air when the tires are hot. Generally speaking, passenger car tires tend to rise by 3 to 4 psi under use.

I'll add that If a vehicle is installed with a tire other than O.E, the pressure recommendation may change depending on the tires construction and load index.
 
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