Page 374 of 666
372 OperationTires and wheels
4
\1
Make sure the tire inflation pressure
of all four tires is correct, using the
tire and loading information placard
1 or the tire inflation pressure placard
located on the driver’s door B-pillar
(
\2
page 362).
In addition to the placard also con-
sult the tire inflation pressure table
(
\2
page 628).
Warning
G
It is the driver’s responsibility to calibrate
the TPMS on the recommended cold infla-
tion pressure. Underinflated tires affect
the ability to steer or brake the vehicle.
You might lose control over the vehicle.1. For vehicles with a gross weight capacity less
than 10 000 lbs (4 536 kg) (USA only).
iReactivate the TPMS after adjusting
the tire inflation pressure to the infla-
tion pressure recommended for the
vehicle operating condition. Tire
pressure should only be adjusted on
cold tires. Observe the recommend-
ed tire inflation pressure on the tire
and loading information placard on
the driver’s door B-pillar
(\2
page 354).
nf_BA.book Page 372 Friday, January 25, 2008 3:53 PM
Page 381 of 666
379 Operation
Tires and wheels
4
Reactivating the Advanced TPMSThe TPMS must be reactivated when you
have adjusted the tire inflation pressure
to a new level (e.g. because of different
load or driving conditions). The TPMS is
then recalibrated to the current tire in-
flation pressures.
\1
Make sure the tire inflation pressure
of all four tires is correct, using the
tire and loading information placard
1
or the tire inflation pressure placard
located on the driver’s door B-pillar
(
\2
page 362).
Warning!
G
It is the driver’s responsibility to calibrate
the TPMS on the recommended cold infla-
tion pressure. Underinflated tires affect
the ability to steer or brake the vehicle.
You might lose control over the vehicle.
1. For vehicles with a gross weight capacity less
than 10 000 lbs (4 536 kg) (USA only).
iReactivate the TPMS after adjusting
the tire inflation pressure to the infla-
tion pressure recommended for the
vehicle operating condition. Tire in-
flation pressure should only be adju-
sted on cold tires. Observe the
recommended tire inflation pressure
on the tire and loading information
placard
1 or on the tire inflation pres-
sure placard on the driver’s door B-
pillar (\2
page 362).
nf_BA.book Page 379 Friday, January 25, 2008 3:53 PM
Page 392 of 666
390 OperationTires and wheels
4
1Maximum tire load rating
The maximum tire load is the maximum
weight the tires are designed to support.
Warning
G
Tires and spare tire should be re-
placed after 6 years, regardless of
the remaining tread.
Maximum tire load
iFor illustrative purposes only. The ac-
tual data on tires is specific to each
vehicle and may vary from the data
shown in the above illustration.
nf_BA.book Page 390 Friday, January 25, 2008 3:53 PM
Page 395 of 666
393 Operation
Tires and wheels
4
1Plies in side wall
2Plies under tread
This marking tells you about the type of
cord and number of plies in the side wall
and under the tread.
Accessory weightThe combined weight (in excess of those
standard items which may be replaced)
of automatic transmission, power steer-
ing, power brakes, power windows, pow-
er seats, radio, and heater, to the extent
that these items are available as factory-
installed equipment (whether installed
or not).
Tire ply material
iFor illustrative purposes only. The
actual data on tires is specific to
each vehicle and may vary from the
data shown in the above illustration.
Tire and loading terminology
nf_BA.book Page 393 Friday, January 25, 2008 3:53 PM
Page 396 of 666
394 OperationTires and wheels
4
Air pressureThe amount of air inside the tire pressing
outward on each square inch of the tire.
Air pressure is expressed in pounds per
square inch (psi), or kilopascal (kPa) or
bars.Aspect ratioDimensional relationship between the
tire section height and the section width
expressed in percentage.
BarAnother metric unit for air pressure.
There are 14.5038 pounds per square
inch (psi) to 1 bar; there are
100 kilopascals (kPa) to 1 bar.BeadThe tire bead contains steel wires
wrapped by steel cords that hold the tire
onto the rim.Cold tire inflation pressureTire inflation pressure when your vehicle
has been sitting for at least 3 hours or
driven no more than 1 mile (1.6 km).
Curb weightThe weight of a motor vehicle with stan-
dard equipment including the maximum
capacity of fuel, oil, and coolant, and, if
so equipped, air conditioning and addi-
tional optional equipment, but without
passengers and cargo.DOT (D
epartment O
f T
ransportation)
A tire branding symbol which denotes
that the tire meets the requirements of
the U.S. Department of Transportation.
nf_BA.book Page 394 Friday, January 25, 2008 3:53 PM
Page 397 of 666
395 Operation
Tires and wheels
4
GAWR (G
ross A
xle W
eight R
ating)
The GAWR is the maximum permissible
axle weight. The gross vehicle weight on
each axle must never exceed the GAWR
for the front and rear axle indicated on
the certification label located below the
driver’s seat on the mounting pillar.
GCWR (G
ross C
ombination W
eight
R
ating) The GCWR is the total permissible
weight of vehicle and trailer when
weighed in combination including a
150 lbs (68 kg) allowance for the pres-
ence of a driver. It is indicated on the
certification label located below the driv-
er’s seat on the mounting pillar.GTW (G
ross T
railer W
eight)
The GTW is the weight of the trailer plus
the weight of all cargo, equipment, lug-
gage etc. loaded on the trailer.
GVW (G
ross V
ehicle W
eight)
The GVW comprises the weight of the
vehicle including fuel, tools, spare
wheel, installed accessories, passen-
gers and cargo and, if applicable, trailer
tongue load. The GVW must never ex-
ceed the GVWR indicated on the certifi-
cation label located below the driver’s
seat on the mounting pillar.
nf_BA.book Page 395 Friday, January 25, 2008 3:53 PM
Page 398 of 666
396 OperationTires and wheels
4
GVWR (G
ross V
ehicle W
eight R
ating)
This is the maximum permissible vehicle
weight of the fully loaded vehicle (weight
of the vehicle including all options, pas-
sengers, fuel, and cargo and, if applica-
ble, trailer tongue load). It is indicated
on the certification label located below
the driver’s seat on the mounting pillar.Kilopascal (kPa)The metric unit for air pressure. There
are 6.9kPa to 1psi; another metric unit
for air pressure is bars. there are
100 kilopascals (kPa) to 1 bar.
Maximum load ratingThe maximum load in kg and pounds
that can be carried by the tire.Maximum loaded vehicle weightThe sum of curb weight, accessory
weight, vehicle capacity weight and pro-
duction options weight.Maximum tire inflation pressureThis number is the greatest amount of
air pressure that should ever be put in
the tire under normal driving conditions.
Normal occupant weightThe number of occupants the vehicle is
designed to seat, multiplied by 68 kg
(150 lbs).Occupant distributionThe distribution of occupants in a vehi-
cle at their designated seating positions.
nf_BA.book Page 396 Friday, January 25, 2008 3:53 PM
Page 399 of 666
397 Operation
Tires and wheels
4
Production options weightThe combined weight of those installed
regular production options weighing
over 5 lbs (2.3 kg) in excess of those
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.PSI (P
ounds per S
quare I
nch)
A standard unit of measure for air pres-
sure. Another metric unit for air pres-
sure is bar or kilopascal (kPa).
Recommended tire inflation pressureRecommended tire inflation pressure for
normal driving conditions listed on the
tire and loading information placard
1 or
on the tire inflation pressure placard lo-
cated on the driver’s door B-pillar.
Provides best handling, tread life and
riding comfort.
RimA metal support for a tire or a tire and
tube assembly upon which the tire
beads are seated.
Side wallThe portion of a tire between the tread
and the bead.TIN (T
ire I
dentification N
umber)
Unique identifier which facilitates efforts
by tire manufacturers to notify purchas-
ers in recall situations or other safety
matters concerning tires and gives pur-
chases the means to easily identify such
tires. The TIN is comprised of the “man-
ufacturer’s identification mark”, “tire
size”, “tire type code” and “date of man-
ufacture”.
1. For vehicles with a gross weight capacity less
than 10 000 lbs (4 536 kg) (USA only).
nf_BA.book Page 397 Friday, January 25, 2008 3:53 PM
