Metric tires]. Increasing the inflation pressure beyond  this  pressure will not increase the tires load carrying capability.
• 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 tires load carrying
capability.
• kPa: Kilopascal, a  metric unit of air pressure.
• 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.
• Bead area of the tire:  Area  of the tire next to the rim.
• 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.
• Rim:  The metal support (wheel) for a  tire or a  tire and  tube assembly upon which  the tire beads are seated.
• 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.
• 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.
• 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 car,
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 or on the inside of the fuel filler  door on
Canadian models, and  in the tire inflation table  in this  chapter.
• 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 car has been parked for at least 3 hours.
pg. 106 Wheels and tires
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:
Curb weight
The weight of the vehicle including a  full tank of fuel and  all standard equipment. It does not include  passengers,
cargo, or optional equipment.
Capacity weight
All weight added to the curb weight, including cargo and  optional equipment. When towing, trailer hitch tongue load
is also part of cargo weight.
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