It’s easy. Here’s how:
1. Purchase a trusted tire pressure gauge.
2. Check your tires “cold”—before you’ve driven or at least three hours after you’ve driven.
3. Insert tire pressure gauge into the valve stem on your tire. (If you are using a digital tire gauge like the one pictured, the gauge should begin reading the air pressure immediately. Refer to your air pressure gauge owner's manual for correct usage instructions. If using a pencil-style tire gauge, the gauge will pop out and show a measured number. When you hear a hissing sound, that’s air escaping the tire. The escaping air shouldn’t affect pressure substantially, unless you hold down the air pressure gauge too long.)
4. Compare the measured psi to the psi found on the sticker inside the driver’s door of your vehicle or in the owner’s manual. DO NOT compare to the psi on your tire’s sidewall.
5. If your psi is above the number, let air out until it matches. If below, add air (or have a Michelin retailer help you) until it reaches the proper number.
Low pressure can lead to tire damage. See the inflation difference:
