07 Wheels and tires
Glossary of tire terminology
B-pillar: The structural member at the side
as the surrounding (ambient) air. This tem-
perature is normally reached after the car
has been parked for at least 3 hours.
Terminology
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of the vehicle behind the front door.
Tire information placard: A placard
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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.
Properly loading your vehicle will provide maxi-
mum return of vehicle design performance.
Sidewall of the tire: Area between the
bead area and the tread.
Tire Identification Number (TIN): A num-
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Tread area of the tire: Area of the perim-
eter of the tire that contacts the road when
mounted on the vehicle.
ber on the sidewall of each tire providing
information about the tire brand and man-
ufacturing plant, tire size and date of man-
ufacturer.
Rim: The metal support (wheel) for a tire or
a tire and tube assembly upon which the
tire beads are seated.
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Inflation pressure: A measure of the
amount of air in a tire.
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Maximum load rating: a figure indicating
the maximum load in pounds and kilo-
grams that can be carried by the tire. This
rating is established by the tire manufac-
turer.
Standard load: A class of P-metric or Met-
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ric 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 pres-
sure: the greatest amount of air pressure
that should ever be put in the tire. This limit
is set by the tire manufacturer.
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Extra load: A class of P-metric or Metric
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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.
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
information can be found on the tire infla-
tion placard(s) located on the driver's side
B-pillar and in the tire inflation table in this
chapter.
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kPa: Kilopascal, a metric unit of air pres-
sure.
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PSI: Pounds per square inch, a standard
unit of air pressure.
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Cold tires: The tires are considered to be
cold when they have the same temperature
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English 
