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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 235/50ZR18, 255/40ZR19 or
285/35ZR19 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 44 psi (300 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 4-21 and Inflation - Tire
Pressure on page 5-72.
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 44 psi (300 kPa).
5-74