As Temperature Drops, So Does Tire Inflation

AKRON, Ohio, Nov. 3, 2004 -- Gone is the heat of summer, replaced by cool nights and mornings. Soon, many areas of the country will be faced with consistently chilly, even sub-freezing temperatures.

This time of year serves as a reminder that a drop in tire inflation pressures corresponds with the falling thermometer readings. Goodyear experts explain that air pressure in a tire typically goes down 1-2 pounds for every 10 degrees of temperature change.

"Odds are that many motorists haven't checked their tire pressure since the weather began turning colder. If the last time the tire pressure was checked was during the heat of summer, with temperatures around 90 degrees, many people could be riding on severely underinflated tires without realizing it," said Bob Toth, marketing manager for Goodyear auto tires.

Maintaining proper air pressure is the single most important thing drivers can do for their tires. Underinflation is the worst enemy a tire can have, as it causes increased treadwear on the shoulder area (outside edges) of the tire. It also generates excessive heat, which reduces tire durability, and it can reduce fuel economy by increasing rolling resistance - since soft tires make the vehicle work harder.

Goodyear suggests checking tire inflation at least once per month with a reliable gauge. To find the proper air pressure for a tire, look in the vehicle owner's manual, in the glove box or on the driver's side doorjamb. Hint: The inflation pressure stamped on the sidewall of a tire is the "maximum" pressure, not the "recommended" pressure.

"Even though consumers can simply and quickly check the air pressure of their tires, it becomes a neglected practice by many," Toth said. "That's too bad, because the four patches of rubber that come in contact with the road surface are vitally important to the performance of the vehicle. They are key for acceleration, lateral traction and braking grip."

The increasing installation of in-dash tire pressure monitor systems on new vehicles will likely help more consumers to pay attention to their tires' pressure levels. Still, Toth urges the old-fashioned method of checking tire inflation.

"At least once a month, take a few minutes and check your tire pressure with an accurate tire gauge. You can't tell if a tire needs air just by looking. It could be underinflated by 10 pounds and still look fine," he said.