High-Speed Operation{CAUTION:Driving at high speeds, 100 mph(160 km/h) or higher, puts an additionalstrain on tires. Sustained high-speeddriving causes excessive heat build upand can cause sudden tire failure. Youcould have a crash and you or otherscould be killed. Some high-speed ratedtires require inflation pressure adjustmentfor high speed operation. When speedlimits and road conditions are such thata vehicle can be driven at high speeds,make sure the tires are rated for highspeed operation, in excellent condition,and set to the correct cold tire inflationpressure for the vehicle load.The CTS-V high-performance tires, size245/45R18 96V and P245/45ZR18 96W requireinflation pressure adjustment when drivingyour vehicle at speeds of 100 mph (160 km/h) orhigher. Set the cold tire inflation pressure tothe maximum inflation pressure shown on the tiresidewall, or 41 psi (282 kPa), whichever islower. See the example following.Example:You will find the maximum load and inflationpressure molded on the tire’s sidewall, in smallletters, near the rim flange. It will read somethinglike this: Maximum load 710 kg (1565 lbs)350 kPa (51 psi) Max. Press.For this example, you would set the coldinflation pressure for high-speed driving at41 psi (282 kPa)When you end high-speed driving, return the tiresto the cold inflation pressures shown on thetire and loading information label. See LoadingYour Vehicle on page 321.404
