Wheels and tyres
238
TYRE GLOSSARY
lbf/in² or psi
Pounds per square inch, an imperial unit of
measure for pressure.
kPa
Kilo Pascal, a metric unit of measure for
pressure.
Cold tyre pressure
The air pressure in a tyre which has been
standing in excess of th ree hours, or driven for
less than 1.6 km (1 mile).
Maximum inflation pressure
The maximum pressure to which the tyre
should be inflated. This pressure is given on
the tyre side wall in lbf/in² (psi) and kPa.
Note: This pressure is the maximum allowed
by the tyre manufacturer. It is not the pressure
recommended for use.
Kerb weight
The weight of a standa rd vehicle, including a
full tank of fuel, any optional equipment fitted,
and with the correct coolant and oil levels.
Gross vehicle weight
The maximum permissible weight of a vehicle
with driver, passen gers, load, luggage,
equipment, and towbar load.
Accessory weight
The combined weight (in excess of those items
replaced) of items available as factory installed
equipment.
Production options weight
The combined weight of options installed
which weigh in excess of 1.4 kg (3 lb) more
than the standard items that they replaced, and
are not already considered in kerb or accessory
weights. Items such as heavy duty brakes, high
capacity battery, special trim etc.
Vehicle capacity weight
The number of seats multiplied by 68 kg
(150 lb) plus the rated amount of load/luggage.
Maximum loaded vehicle weight
The sum of kerb wei ght, accessory weight,
vehicle capacity weig ht, plus any production
option weights.
Rim
The metal support for a ty re, or tyre and tube,
upon which the tyre beads are seated.
Bead
The inner edge of a tyre th at is shaped to fit to
the rim and form an air tight seal. The bead is
constructed of steel wires which are wrapped,
or reinforced, by the ply cords.
