Buick Regal Owners & Service Manuals

Buick Regal: Tire Pressure

Tires need the correct amount of air pressure to operate effectively.

Caution: Neither tire underinflation nor overinflation is good.

Underinflated tires, or tires that do not have enough air, can result in:

  • Tire overloading and overheating which could lead to a blowout.
  • Premature or irregular wear.
  • Poor handling.
  • Reduced fuel economy.

Overinflated tires, or tires that have too much air, can result in:

  • Unusual wear.
  • Poor handling.
  • Rough ride.
  • Needless damage from road hazards.

The Tire and Loading Information label on the vehicle indicates the original equipment tires and the correct cold tire inflation pressures. The recommended pressure is the minimum air pressure needed to support the vehicle's maximum load carrying capacity. How the vehicle is loaded affects vehicle handling and ride comfort. Never load the vehicle with more weight than it was designed to carry.

When to Check

Check the tires once a month or more. Do not forget the compact spare, if the vehicle has one.

The cold compact spare tire pressure should be at 420 kPa (60 psi).

How to Check

Use a good quality pocket-type gauge to check tire pressure.

Proper tire inflation cannot be determined by looking at the tire.

Check the tire inflation pressure when the tires are cold, meaning the vehicle has not been driven for at least three hours or no more than 1.6 km (1 mi).

Remove the valve cap from the tire valve stem. Press the tire gauge firmly onto the valve to get a pressure measurement.

If the cold tire inflation pressure matches the recommended pressure on the Tire and Loading Information label, no further adjustment is necessary.

If the inflation pressure is low, add air until the recommended pressure is reached. If the inflation pressure is high, press on the metal stem in the center of the tire valve to release air.

Recheck the tire pressure with the tire gauge.

Put the valve caps back on the valve stems to keep out dirt and moisture and prevent leaks. Use only valve caps designed for the vehicle by GM. TPMS sensors could be damaged and would not be covered by the vehicle warranty.

Tire Pressure for High-Speed Operation

Warning: Driving at high speeds, 160 km/h (100 mph) or higher, puts additional strain on tires.

Sustained high-speed driving causes excessive heat buildup and can cause sudden tire failure.

This could cause a crash, and you or others could be killed.

Some high-speed rated tires require inflation pressure adjustment for high-speed operation. When speed limits and road conditions allow the vehicle to be driven at high speeds, make sure the tires are rated for high-speed operation, are in excellent condition, and are set to the correct cold tire inflation pressure for the vehicle load.

Vehicles with P225/55R17 95H size tires require inflation pressure adjustment when driving the vehicle at speeds of 160 km/h (100 mph) or higher. Set the cold inflation pressure to 260 kPa (38 psi).

Vehicles with 245/45R18 Conti 96H size tires require inflation pressure adjustment when driving the vehicle at speeds of 160 km/h (100 mph) or higher. Set the cold inflation pressure to 270 kPa (39 psi).

Vehicles with 235/50R18 97V size tires require inflation pressure adjustment when driving the vehicle at speeds of 160 km/h (100 mph) or higher. Set the cold inflation pressure to 250 kPa (36 psi).

Vehicles with 245/40R19 94W size tires require inflation pressure adjustment when driving the vehicle at speeds of 160 km/h (100 mph) or higher. Set the cold inflation pressure to 290 kPa (42 psi).

Return the tires to the recommended cold tire inflation pressure when high-speed driving has ended.

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