High-Speed Operation - Chevrolet 2008 Equinox Owner's Manual

High-Speed Operation

CAUTION:
{
Driving at high speeds, 100 mph (160 km/h) or
higher, puts an additional strain on tires.
Sustained high-speed driving causes excessive
heat build up 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.
If your vehicle has P235/50R18 size tires, they will
require inflation pressure adjustment when driving your
vehicle at speeds of 100 mph (160 km/h) or higher.
Set the cold inflation pressure to the maximum inflation
pressure shown on the tire sidewall, or 35 psi (241 kPa),
whichever is lower. See the example following. When you
end this high-speed driving, return the tires to the cold tire
inflation pressure shown on the Tire and Loading
Information label. See Loading Your Vehicle on
page 4-22 and Inflation - Tire Pressure on page 5-59.
Example:
You will find the maximum load and inflation pressure
molded on the tire's sidewall, in small letters, near the
rim flange. It will read something like this: Maximum load
690 kg (1521 lbs) 300 kPa (44 psi) Max. Press.
For this example, you would set the inflation pressure
for high-speed driving at 35 psi (241 kPa).
5-61