EX30 Tire terminology | Volvo Support EN-CA

Tire information placard	A plate that specifies OE1 tire size, recommended tire pressure and the maximum weight the vehicle can carry.
Tire identification number (TIN)	A number on the sidewall of each tire with information about tire brand and manufacturing plant, tire size and date of manufacture.
Inflation pressure	A measurement of how much air is in the tire.
Standard load	A class of P-metric or metric tires designed for a maximum load at 35 psi2. The load-bearing capacity of the tires does not increase if the tire pressure is increased above this pressure.
Extra load	A class of P-metric or metric tires designed for a heavier maximum load at 41 psi3. The load-bearing capacity of the tires does not increase if the tire pressure is increased above this pressure.
kPa	Kilopascal, a metric unit for air pressure.
psi	Pounds per square inch, a standard unit for air pressure.
B-pillar	The beam on the side of the vehicle behind the driver's door.
Bead area of the tire	The tire's surface area next to the wheel rim.
Sidewall of the tire	The surface between the base of the tire and the tread.
Tread area of the tire	The surface around the tire in contact with the road when the tire is installed on the vehicle.
Rim	Metal support (wheel) for a tire or tire and inner tube unit against which the base of the tire seals.
Maximum load rating	A figure that specifies the maximum load in pounds and kilograms that the tire can carry. This classification is made by the tire manufacturer.
Maximum permissible inflation pressure	The maximum tire pressure that the tire should ever be subjected to. This limit is specified by the tire manufacturer.
Recommended tire inflation pressure	Tire pressure, specified by Volvo, based on the type of tires installed on a vehicle on delivery. This information is available on the tire plate on the B-pillar on the driver's side and in the tire pressure table.
Cold tires	Tires are considered cold when they have the same temperature as the surrounding air. This temperature is normally reached when the vehicle has been parked for at least three hours.