Spare tires mounted under the rear of the vehicle are particularly troublesome in this regard, as they may need to be removed to check the pressure. (Note that some are small “doughnut” temporary spares that run much higher pressures than the regular tires.) Unfortunately, this isn’t always easy. If your car has a spare tire (some newer ones just have a sealing kit and a pump), don’t forget to check the pressure in that, as well, as air can leak out over time.Some vehicles have different recommended inflation pressures for the front and rear tires, and sometimes a higher pressure (usually for the rear) will be listed for if you’re carrying a heavy load.(See the section on how temperature affects tire pressures below.) Things that can throw off the reading include the car being in a garage that’s warmer (or colder) than the outside temperature, having the sun hitting one or two of the tires, or having driven on them for more than a couple of miles. This can be trickier than you might think.
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