4806-1. Specifications
Warning: The temperature grades of a tire assume that it is pro perly
inflated and not overloaded.
Excessive speed, underinflation, or excessive loading, either s epa-
rately or in combination, can cause heat buildup and possible t ire fail-
ure.
Glossary of tire terminology
Tire related term Meaning
Cold tire inflation
pressure Tire pressure when the vehicle has been
parked for three hours or more, or has not
been driven more than 1 mile or 1.5 km under
that condition
Maximum inflation
pressure The maximum cold inflated pressure to which a
tire may be inflated, shown on the sidewall of
the tire
Recommended
inflation pressure Cold tire inflation pressure recommended by a
manufacturer.
Accessory weight The combined weight (i n excess of those stan-
dard items which may be replaced) of auto-
matic transmission, po wer steering, power
brakes, power windows, power seats, radio
and heater, to the exten t that these items are
available as factory-installed equipment
(whether installed or not)
Curb weight The weight of a motor vehicle with standard
equipment, including th e maximum capacity of
fuel, oil and coolant, and if so equipped, air
conditioning and additional weight optional
engine
Maximum loaded
vehicle weight The sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options weight
4816-1. Specifications
6
Vehicle specifications Tire related term Meaning
Normal occupant
weight 150 lb. (68 kg) times the number of occupants
specified in the second column of Table 1
* that
follows
Occupant distribution Distribution of occupant s in a vehicle as speci-
fied in the third column of Table 1
* below
Production options
weight The combined weight of installed regular pro-
duction options weighing over 5 lb. (2.3 kg) in
excess of the standard items which they
replace, not previously considered in curb
weight or accessory weight, including heavy
duty brakes, ride levelers, roof rack, heavy duty
battery, and special trim
Rim A metal support for a ti re or a tire and tube
assembly upon which the tire beads are seated
Rim diameter
(Wheel diameter) Nominal diameter o f the bead seat
Rim size designation R im diameter and width
Rim type designation The industry manufacture r’s designation for a
rim by style or code
Rim width Nominal distan ce between rim flanges
Vehicle capacity
weight (Total load
capacity) The rated cargo and luggage load plus 150 lb.
(68 kg) times the vehicl e’s designated seating
capacity
Vehicle maximum load
on the tire The load on an individual tire that is determined
by distributing to each axle its share of the
maximum loaded vehicle weight, and dividing
by two
