User 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 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 the Vehicle on page 4-31.
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.
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