2014 Chevrolet SS Owner Manual - Page 318

10-36 Vehicle Care conditions, winter tires should be installed. See Winter Tires on page 10-35. Caution (Continued) damage. Keep tires set to the correct inflation pressure and when possible, avoid contact with curbs, potholes, and other road hazards. Tire Sidewall Labeling Useful information about a tire is molded into its sidewall. The examples show a typical passenger tire sidewall. { Caution Ultra high performance summer tires have rubber compounds that lose flexibility and may develop surface cracks in the tread area at temperatures below -7°C (20°F). Always store ultra high performance summer tires indoors and at temperatures above -7°C (20°F) when not in use. If the tires have been subjected to -7°C (20°F) or less, let them warm up in a heated space to at least 5°C (40°F) for 24 hours or more before being installed or driving a vehicle on which they are installed. Do not apply heat or blow heated air directly on the tires. Always inspect tires before use. See Tire Inspection on page 10-46. Summer Tires Ultra High Performance Summer Tires This vehicle may come with 245/40R19 and 275/35R19 ultra high performance summer tires. These tires have a special tread and compound that are optimized for maximum dry and wet road performance. This special tread and compound will have decreased performance in cold climates, and on ice and snow. Driving a vehicle with ultra high performance summer tires when temperatures are below approximately 5°C (40°F) is not recommended. If driving in these Passenger (P-Metric) Tire Example (1) Tire Size: The tire size is a combination of letters and numbers used to define a particular tire's width, height, aspect ratio, construction type, and service description. See the "Tire Size" illustration later in this section for more detail.