High Speed Operation - Chevrolet 2006 TrailBlazer EXT 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 P255/50R20 104V size tires installed
on the rear axle, they will require inflation pressure
adjustment when driving your vehicle at speeds above
99 mph (160 km/h). Set the cold inflation pressure,
for the rear tires only, 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 4-48.
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).
The inflation pressure for the front tires should be set to
the cold tire inflation pressure shown on the Tire and
Loading Information label.
Racing or other competitive driving may affect the
warranty coverage of your vehicle. See your warranty
booklet for more information.