Cadillac 2006 CTS Owner's Manual page 341

High Speed Operation (CTS-V)
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.
The CTS-V high-performance tires, size 245/45R18 96V
and P245/45ZR18 96W require inflation pressure
adjustment when driving your vehicle at speeds of
100 mph (160 km/h) or higher. Set the cold tire inflation
pressure to the maximum inflation pressure shown
on the tire sidewall, or 41 psi (282 kPa), whichever
is lower.
See the example following.
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 710 kg (1565 lbs) 350 kPa (51 psi) Max. Press.
For this example, you would set the cold inflation
pressure for high-speed driving at 41 psi (282 kPa)
When you end high-speed driving, return the tires to
the cold inflation pressures shown on the tire and
loading information label. See Loading Your Vehicle
on page 4-32.
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