2010 Volvo XC70 Owner's Manual - Page 249

06 Maintenance and specifications Wheels and tires 11. Treadwear, Traction, and Temperature grades: See page 251 for more information. 12. Maximum permissible inflation pressure: the greatest amount of air pressure that should ever be put in the tire. This limit is set by the tire manufacturer. • Extra load: A class of P-metric or Metric tires designed to carry a heavier maximum load at 41 psi [43 psi (2.9 bar) for Metric tires]. Increasing the inflation pressure beyond this pressure will not increase the tire's load carrying capability. sure that should ever be put in the tire. This limit is set by the tire manufacturer. • Recommended tire inflation pressure: inflation pressure, established by Volvo, which is based on the type of tires that are mounted on a vehicle at the factory. This inflation pressure is affected by the number of occupants in the vehicle, the amount of cargo, and the speed at which the vehicle will be driven for a prolonged period. This information can be found on the tire inflation placard(s) located on the driver's side B-pillar and in the tire inflation table in this chapter. • kPa: Kilopascal, a metric unit of air pressure. Glossary of tire terminology The tire suppliers may have additional markings, notes or warnings such as standard load, radial tubeless, etc. • PSI: Pounds per square inch, a standard unit of air pressure. • B-pillar: The structural member at the side of the vehicle behind the front door. • Tire information placard: A placard showing the OE (Original Equipment) tire sizes, recommended inflation pressure, and the maximum weight the vehicle can carry. • Bead area of the tire: Area of the tire next to the rim. • Cold tires: The tires are considered to be cold when they have the same temperature as the surrounding (ambient) air. This temperature is normally reached after the vehicle has been parked for at least 3 hours. 06 • Sidewall of the tire: Area between the bead area and the tread. • Tread area of the tire: Area of the perimeter of the tire that contacts the road when mounted on the vehicle. • Tire Identification Number (TIN): A number on the sidewall of each tire providing information about the tire brand and manufacturing plant, tire size and date of manufacturer. • Rim: The metal support (wheel) for a tire or a tire and tube assembly upon which the tire beads are seated. Vehicle loading Properly loading your vehicle will provide maximum return of vehicle design performance. Before loading your vehicle, familiarize yourself with the following terms for determining your vehicle's weight ratings, with or without a trailer, from the vehicle's Federal/Canadian Motor Vehicle Safety Standards (FMVSS/ CMVSS) label, and the vehicle's tire information placard: `` • Inflation pressure: A measure of the amount of air in a tire. • Maximum load rating: a figure indicating the maximum load in pounds and kilograms that can be carried by the tire. This rating is established by the tire manufacturer. • Standard load: A class of P-metric or Metric tires designed to carry a maximum load at 35 psi [37 psi (2.5 bar) for Metric tires]. Increasing the inflation pressure beyond this pressure will not increase the tires load carrying capability. • Maximum permissible inflation pressure: the greatest amount of air pres- 249