How to Reduce Tire Inflation for Snow

Use a tire gauge when reducing pressure.

Tires with more air in them, or a higher tire pressure, are inflated more and thus have a smaller surface at which the rubber meets the road. Increasing tire pressure reduces friction on the road (which can, incidentally, improve gas mileage), while lower pressure will lead to more friction. This increased friction is why many drivers lower tire pressure in snowy and icy conditions.

Things You'll Need

• Tire gauge

Instructions

1. Unscrew the cap on the tire valve and check the air pressure. Do this while the tire is cold (i.e. before it has been driven for more than a mile) to get the most accurate reading. Tire pressure goes up a little when the tires are warm.

2. Let air out of the tires by gently depressing the center of the tire valve. Again, make sure the tires are cool when you do this, as releasing air from hot tires can be dangerous.

3. Re-check the tire pressure, letting out more air if necessary, making sure not to go below the minimum specifications outlined for your vehicle.

Tips & Warnings

• Snow tires or studs are a better way to increase traction in snowy and icy conditions.

• Take care not to deflate the tire too much. Under-inflated tires are not safe and risk failing at high speeds.

• The pressure in a tire automatically drops between one and two PSI for every 10 degree Fahrenheit drop in outdoor temperature, so reducing tire pressure manually may not be necessary. In fact, the Rubber Manufacturers of America recommend against reducing tire pressure, as it is not shown to increase traction.

References

• Rubber Manufacturers Association: Winter Driving Tips
• Drivers.com: Myths Abound on Correct Tire Inflation