High-Speed Operation - Pontiac Montana SV6 2007 Owner's Manual

High-Speed Operation

CAUTION:
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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.
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If your vehicle has P225/60R17 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 38 psi (262 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 389 and Inflation - Tire Pressure on page 466.
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 38 psi (262 kPa).