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Tyre Pressure

Learn how to check the pressure of your tyres for optimal reliability and safe driving.

Tyre Pressure

How to Check Tyre Pressure.

Tyres have been known to lose up to 0.06 BAR (every month, so check all tyres, including your spare, once a month (or before a long trip). It’s easy. Here’s how:

  1. Purchase a trusted tyre pressure gauge.
  2. Check your tyres “cold” – before you’ve driven or at least three hours after you’ve driven.
  3. Insert the tyre pressure gauge into the valve stem on your tyre. (If you are using a digital tyre 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 tyre gauge, the gauge will “pop” out and show a measured number. When you hear a “pssst” sound, that’s air escaping the tyre. The escaping air shouldn’t affect pressure substantially, unless you hold down the air pressure gauge too long.)
  4. Compare the measured BAR to the BAR found on the sticker inside the driver’s door of your vehicle or in owner’s manual. DO NOT compare to the BAR on your tyre’s sidewall.
  5. If your BAR 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 tyre pressures can lead to tyre damage. See the difference for the following vehicles:

Nitrogen Versus Compressed Air

Most tyres are filled with compressed air. But some tyre retailers have started to use nitrogen. (Nitrogen is simply dry air with the oxygen removed. Air contains nearly 79% nitrogen already.) Because nitrogen replaces oxygen, less air can escape your tyres, and your inflation pressure stays higher for longer. Unfortunately, there are other possible sources of leaks (tyre/rim interface, valve, valve/rim interface and the wheel), which prevent the guarantee of pressure maintenance for individuals using air or nitrogen inflation.

Nitrogen and compressed air CAN be mixed, if needed. Tyres manufactured by MICHELIN are designed to deliver their expected tyre performance when inflated with air or nitrogen, as long as the user respects the pressures that are recommended by the vehicle manufacturer on the vehicle’s placard or by the tyre manufacturer. For the ultimate in driving comfort, ensure that you read the placard and maintain the expressed figures.