Tire Pressure for High-Speed Operation

Buick Regal / Buick Regal Owners Manual / Vehicle Care / Electrical System / Tire Pressure for High-Speed Operation

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

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

You could have 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 are such that a vehicle can be driven at high speeds, make sure the tires are rated for high-speed operation, in excellent condition, and set to the correct cold tire inflation pressure for the vehicle load.

Vehicles with P235/50R18 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 P245/40R19 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 310 kPa (45 psi).

Return the tires to the recommended cold tire inflation pressure when high-speed driving has ended. See Vehicle Load Limits  and Tire Pressure .

    See also:

    Tire Pressure Light
    For vehicles with the Tire Pressure Monitor System (TPMS), this light comes on briefly when the engine is started. It provides information about tire pressures and the TPMS. ...

    Retained Accessory Power (RAP)
    These vehicle accessories may be used for up to 10 minutes after the engine is turned off: Audio System Power Windows Sunroof The power windows and sunroof will continue to work for up to ...

    AM
    The range for most AM stations is greater than for FM, especially at night. The longer range can cause station frequencies to interfere with each other. For better radio reception, most AM r ...