What effect do temperature variations have on tires?

What effect do temperature variations have on tires?

• A. Fuel tanks to overflow during the day causing a fire hazard.
• B. Electrical systems to fail in heat.
• C. Tires to overinflate during the day and underinflate at night.
• D. Oil fluid levels to become overfull and cause leaks during the day, or to provide insufficient lubrication at night when the oil cools

Answer: (C)

Tire pressure changes with temperature because air expands when it’s hot and contracts when it’s cold. During the day, heat from the sun and road raises the air pressure inside the tire, causing overinflation. At night, cooler temperatures cause the air to contract, leading to underinflation. This is why the effect described is tires overinflating in warmth and underinflating as it cools. Keep in mind this matters for safety and wear: overinflated tires can ride stiff and wear more in the center, while underinflated tires increase rolling resistance, generate more heat, wear the edges, and can be more prone to damage or a blowout. A practical approach is to check tire pressures with cold tires (before driving or after the car has been sitting for a few hours) and adjust for seasonal temperature changes, since air pressure can shift roughly about 1 psi for every 10°F change. The other options don’t describe the tire-pressure effect caused by ambient temperature.

Tire pressure changes with temperature because air expands when it’s hot and contracts when it’s cold. During the day, heat from the sun and road raises the air pressure inside the tire, causing overinflation. At night, cooler temperatures cause the air to contract, leading to underinflation. This is why the effect described is tires overinflating in warmth and underinflating as it cools.

Keep in mind this matters for safety and wear: overinflated tires can ride stiff and wear more in the center, while underinflated tires increase rolling resistance, generate more heat, wear the edges, and can be more prone to damage or a blowout. A practical approach is to check tire pressures with cold tires (before driving or after the car has been sitting for a few hours) and adjust for seasonal temperature changes, since air pressure can shift roughly about 1 psi for every 10°F change. The other options don’t describe the tire-pressure effect caused by ambient temperature.