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Maintenance Tyres and wheels
Load Index An assigned number
ranging from 1 to 279 that corre
-
sponds to the load carrying capacity
of a tyre.
Maximum Inflation Pressure The
maximum air pressure to which a
cold tyre may be inflated. The maxi
-
mum air pressure is molded onto
the sidewall.
Maximum Load Rating The load rat
-
ing for a tyre at the maximum per
-
missible inflation pressure for that
tyre.
Maximum Loaded Vehicle Weight
The sum of kerb weight; accessory
weight; vehicle capacity weight; and
production options weight.
Normal Occupant Weight The num
-
ber of occupants a vehicle is
designed to seat multiplied by 68 kg
(150 lbs.).
Occupant Distribution Designated
seating positions.
Outward Facing Sidewall The side of
a asymmetrical tyre that has a par
-
ticular side that faces outward
when mounted on a vehicle. The
outward facing sidewall bears white
lettering or bears manufacturer,
brand, and/or model name molding
that is higher or deeper than the
same moldings on the inner facing
sidewall.
Passenger (P-Metric) Tyre tyre
used on passenger cars and some
light duty trucks and multipurpose
vehicles.
Ply A layer of rubber-coated parallel
cords.
Pneumatic tyre A mechanical device
made of rubber, chemicals, fabric
and steel or other materials, that,
when mounted on an automotive
wheel, provides the traction and
contains the gas or fluid that sus
-
tains the load.
Production options weight The
combined weight of installed regular
production options weighing over
2.3 kg (5 lb.) in excess of the stan
-
dard items which they replace, not
previously considered in kerb weight
or accessory weight. Examples
include heavy duty brakes, ride lev
-
elers, roof rack, heavy duty battery,
and special trim.
Recommended Inflation Pressure
Vehicle manufacturer's recom
-
mended tyre inflation pressure and
shown on the tyre placard.
Radial Ply Tyre A pneumatic tyre in
which the ply cords that extend to
the beads are laid at 90 degrees to
the centre of the tread.
Rim A metal support for a tyre and
upon which the tyre beads are
seated.
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