inflation pressure SAAB 9-5 2005 Owners Manual

168 Starting and driving
Driving at nightBear in mind the following points when
driving at night:
 Nighttime driving requires your full con-
centration.
 Do not rush. Count on your journey taking
slightly longer.
 The number of drivers under the influence
of drugs is likely to be greater at night than
during the day.
 Do not stare at the headlights of onco-
ming vehicles.
 Avoid driving at night if you have poor eye-
sight. Night vision deteriorates with age.
 Keep your car's headlights, windows and
mirrors clean. Also, if you wear glasses,
make sure they are clean.
 Make sure you are well rested before star-
ting a long journey. Take a break every
other hour.
 Only eat light meals. Heavy meals have a
tendency to induce tiredness.
Driving with a loadThe driving characteristics of the car are
affected by the way it is loaded.
 Place heavy loads as far forward and as
low as possible in the trunk.
 Secure the load to the tie downs, see
page 123.
 The load should be such that the car´s
total weight or axle weight are not
exceeded, see page 252.
 Heavy loads mean that the car’s center of
gravity is further back. As a result, the car
will sway more during evasive steering.
 Never exceed the permissible load in the
roof box, even if there is room for more.
 Ensure that the tire pressure is correct –
slight overinflation is preferable to under-
inflation.
 The braking distance of a loaded car is
always greater. Keep your distance from
the vehicle in front.
 Roof loads can negatively affect tele-
communication.Tire pressure, see page 262 and back
cover.
IB1295
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169 Starting and driving
Tires
The tire pressure should match the current
load and speed of the car; for cars sold in
U.S. see page 226; for cars sold in Canada
see page 261.
The tire pressures given apply to
cold
tires,
that is tires that are the same temperature
as the outside air temperature.
The tire pressure increases as the tires
become warm (e.g. during highway driving)
with approximately 0.3 bar (4 psi). When
the temperature of the tires changes by 50°
(10°C), the tire pressure will change 0.1 bar
(2 psi).Never reduce the pressure of a hot tire. If the
tires are hot when you check them, only
increase the pressure, if necessary.
Underinflated tires wear more quickly than
slightly overinflated tires.
If a valve is leaking, simply unscrew it and fit
a new one.
Important!
Remember to adjust the tire
pressures if you change the load in the car
or intend to drive at substantially lower or
higher speeds than normal.
WARNING
Check the tire pressure
at least once a
month
and before long journeys. Under-
inflation can result in:
 Punctures
 Separation of the tire and tread
 Damage to the sidewalls
 Damage to the rims on poor roads
 Poor handling characteristics
 Premature tire wear
 Increased fuel consumption.
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217 Car care and technical information
Tires Your new vehicle comes with high-quality
tires made by a leading tire manufacturer. If
you ever have questions about your tire
warranty and where to obtain service, see
your Saab Warranty and Service Record
Booklet for details.
Inflation - Tire PressureThe Tire-Loading Information label shows
the correct inflation pressures for your tires
when they’re cold. “Cold” means your
vehicle has been sitting for at least three
hours or driven no more than 1 mile (1.6
km).Notice:
Don’t let anyone tell you that
underinflation or overinflation is all
right. It’s not. If your tires don’t have
enough air (underinflation), you can get
the following:
Too much flexingToo much heatTire overloadingBad wearBad handlingBad fuel economy
If your tires have too much air (overinfla-
tion), you can get the following:Unusual wearBad handlingRough ride
Needless damage from road hazards
Adjust the tire pressure to match the current
load and speed of the car (see page 261).
The stated tire pressures apply to cold tires,
i.e. tires that are the same temperature as
the outside air temperature. Tire pressure
increases as the tires become warm (e.g.
during highway driving) by approximately
0.3 bar (4 psi). When the temperature of the
tires changes by 50°F (10°C), the tire pres-
sure will change 0.1 bar (2 psi).
Never reduce the pressure of a hot tire. If the
tires are hot when you check them, only
increase the pressure, if necessary.
WARNING
Poorly maintained and improperly used
tires are dangerous.
 Overloading your tires can cause
overheating as a result of too much
friction. You could have an blow-out
and a serious accident. See “Loading
Your Vehicle” on page 226.
 Underinflated tires pose the same
danger as overloaded tires. The
resulting accident could cause serious
injury. Check all tires frequently to
maintain the recommended pressure.
Tire pressure should be checked
when your tires are cold.
 Overinflated tires are more likely to be
cut, punctured or broken by a sudden
impact – such as when you hit a
pothole. Keep tires at the recom-
mended pressure.
 Worn, old tires can cause accidents. If
your tread is badly worn, or if your tires
have been damaged, replace them.
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218 Car care and technical informationWhen to checkCheck your tires once a month or more.
Don’t forget your compact spare tire. It
should be at 60 psi (420 kPa).How to CheckUse a good quality pocket-type gauge to
check tire pressure. You can’t tell if your
tires are properly inflated simply by looking
at them. Radial tires may look properly infla-
ted even when they’re underinflated.
Be sure to put the valve caps back on the
valve stems. They help prevent leaks by
keeping out dirt and moisture.Tire Inspection and RotationAny time you notice unusual wear, rotate
your tires as soon as possible and check
wheel alignment. Also check for damaged
tires or wheels. See “When It Is Time for
New Tires” on page 219 and “Wheel Repla-
cement” on page 222 for more information.
The purpose of regular rotation is to achieve
more uniform wear for all tires on the
vehicle. The first rotation is the most impor-
tant.
When rotating your tires, always use the
correct rotation pattern. Left front tire to left
rear. Left rear tire to right front. Right front to
right rear. Right rear to left front.
Don’t include the compact spare tire in your
tire rotation.
After the tires have been rotated, adjust the
front and rear inflation pressures as shown
on the Tire-Loading Information label. Make certain that all wheel nuts are properly tigh-
tened. See page 233.
Flat spottingAll tires get hot, especially on long journeys
or when the car is driven hard. After the car
has been parked with hot tires and the tires
have cooled down, a flat spot can form in the
tire, where it is in contact with the ground.
The same can occur if the car has not been
moved for a long time.
Flat spots can cause vibration that can be
felt through the steering wheel, similar to
that experienced when the wheels need
balancing.
Flat spots of this type disappear once the
tires get hot again, usually after 10–15 miles
(20–25 km) of driving at cruising speed.
WARNING
Rust or dirt on a wheel, or on the parts to
which it is fastened, can make wheel nuts
become loose after a time. The wheel
could come off and cause an accident.
When you change a wheel, remove any
rust or dirt from places where the wheel
attaches to the vehicle. In an emergency,
you can use a cloth or a paper towel to do
this; but be sure to use a scraper or wire
brush later, if you need to, to get all the
rust or dirt off. See “Changing a wheel” on
page 231.
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224 Car care and technical informationTire Sidewall LabelingUseful information about a tire is molded
into it´s sidewall.Tire size:
The tire size ia a combination of
letters and numbers used to define a parti-
cular tire´s width, height, aspect ratio, cons-
truction type and service description.
Department of Transportation (DOT):

The Department of Transportation (DOT)
code indicates that the tire is in compliance
with the U.S. Department of Transportation
Motor Vehicle Safety standards.
Tire Identification Number (TIN):
The let-
ters and numbers following DOT code are
the Tire Identification Number (TIN). The
TIN shows the manufacturer and plant
code, tire size, and date the tire was manu-
factured. The TIN is molded onto both sides
of the tire.
Tire Ply Material:
The type of cord and
number of plies in the sidewall and under
the tread.
Uniform Tire Quality Grading (UTQG):

Tire manufacturers are required to grade
tires based on performance factors:
treadwear, traction and temperature resis-
tance. For more information see “Uniform
Tire Quality Grading” on page 221.
Maximum Cold Inflation Load Limit:
Max-
imum load that can be carried and the max-
imum pressure needed to support that load.
For information on recommended tire pres-
sure see “Lowest recommended tire pres-
sure, cold tires” on page 261and “Loading
Your Vehicle” on page 226.
Tire SizeThe following illustration shows an example
of a typical passenger car tire size.Tire Width:
The three-digit number indica-
tes the tire section width in millimeters from
sidewall to sidewall.
215
/55 R 16 93 H
| |||||
abcdef
aTire Width
b Aspect Ratio
c Belt Rating
d Rim diameter
e Load range
f Speed rating
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226 Car care and technical informationLoading Your VehicleThis is an example of what your vehicle´s
Tire-Loading Information/Certification label
might look like. It is located on the B-pillar
and shows how much weight your vehicle
may properly carry. The label tells you the
proper size, and recommended inflation
pressures for the tires on your vehicle. It
also gives you important information about
the number of people that can be in your
vehicle and the total weight that you can
carry. This weight is called the Vehicle
Capacity Weight, and includes the weight of
all occupants, cargo and all nonfactory-
installed options.
Tire Terminology and DefinitionsAir Pressure:
The 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).
Accessory Weight:
This means the combi-
ned weight of optional accessories, for
example, automatic transmission, power
steering, power brakes, power windows,
power seats, radio and air conditioning.
Aspect Ratio:
The relationship of a tire´s
height to its width.
Belt:
A rubber coated layer of cords that is
located between the plies and the tread.
Cords may be made from steel or other rein-
forcecing materials.
Bias Ply Tire:
A pneumatic tire in which the
ply cords that extend to the beads are laid at
alternate angles substantially less than 90
degrees to the centerline of the tread.
Cold Inflation Pressure:
The amount of air
pressure in a tire, measured in pounds per
square inch (psi) or kilopascal (kPa), before
a tire have built up heat from driving. See
“Inflation - Tire Pressure” on page 217.
Curb weight:
This means the weight of a
motor vehicle with standard and optional
equipment including the maximum capacity
of fuel, oil and coolant, without passengers
and cargo.
DOT Markings:
A code molded into the
sidewall of a tire signifying that the tire is in
compliance with the U.S. Department of
Transportation motor vehicle safety stan-
dards. The DOT code includes the Tire
Identification Number (TIN), an alphanume-
ric designator which can also indentify the
tire manufacturer, production plant, brand
and date of production.
GVWR:
Gross Vehicle Weight Rating see
“Loading Your Vehicle” on page 226.
GAWR FRT:
Gross Axle Weight Rating for
the front axle, see “Loading Your Vehicle”
on page 226.
GAWR RR:
Gross Axle Weight Rating for
the rear axle, see “Loading Your Vehicle” on
page 226.
Intended Outboard Sidewall:
The side of
an asymmetrical tire that must always face
outward when mounted on a vehicle.
Kilopascal (kPa):
The metric unit for air
pressure. There are 6.9 kPa to one psi.
Light Truck (LT-Metric) Tire:
A tire used
on light duty trucks and some multipurpose
passenger vehicles.
Load Index:
An assigned number ranging
from 1 to 279 that corresponds to the load
carrying capacity of a tire.
This label can only be found on vehicles
sold in the U.S.
Vehicles sold in Canada have the tire
information label in the glovebox, see
page 262.
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227 Car care and technical information
Maximum Load rating:
The load rating for
a tire at the maximum permissible inflation
pressure for that tire.
Maximum Loaded Vehicle Weight:
The
sum of curb weight; accessory weight;
vehicle capacity weight; and production
options weight.
Maximum Permissible Inflation Pres-
sure:
The maximum cold inflation pressure
to which a tire may be inflated.
Normal occupant weight:
The number of
occupants a vehicle is designed to seat mul-
tipled by 150 pounds (68 kg). See “Loading
Your Vehicle” on page 226.
Occupant Distribution:
Designated sea-
ting positions.
Outward Facing Sidewall: The side of a
asymmetrical tire that has a particular side
that faces outward when mounted on a
vehicle. The side of the tire that contains a
whitewall bears white lettering or bears
manufacturer, brand and or model name
molding on the other sidewall of the tire.
Passenger (P-Metric) Tire:
A tire used on
passenger cars and some light duty trucks
and multipurpose vehicles.
Recommended Inflation Pressure:

Vehicle manufacturer´s recommended tire
inflation pressure shown on the tire label,
see “Inflation - Tire Pressure” on page 217
and “Loading Your Vehicle” on page 226.
Radial Ply Tire:
A pneumatic tire in which
the ply cords that extend to the beads are
laid at substantially 90 degrees to the cen-
terline of the tread.
Rim:
A metal support for a tire or a tire and
tube assembly upon which the tire beads
are seated.
Sidewall:
The portion of a tire between the
tread and the bead.
Speed rating:
An alphanumeric code
assigned to a tire indicating the maximum
speed at which a tire can operate.
Traction:
The friction between the tire and
the road surface. The amount of grip provi-
ded.
Treadwear Indicators:
Narrow bands,
sometimes called “wear bars”, that show
across the tread of a tire when only
2/32 inch of tread remains. See “When It Is
Time for New Tires” on page 219.
Tread Width:
The width of the tire´s tread.
UTQGS:
Uniform Tire Quality Grade Stan-
dards, a tire information system that provi-
des consumers with ratings for a tire´s trac-
tion, temperature and treadwear. Ratings
are determined by tire manufacturers using
government testing procedures. The rating
are molded into the sidewall of the tire. See
“Uniform Tire Quality Grading” on
page 221.
Vehicle Capacity Weight:
Is the number of
designated seating positions multipled by
150 pounds (68 kg) plus the rated cargo
load. See “Loading Your Vehicle” on
page 226.
Vehicle Maximum Load on the Tire:
Load
on an individual tire due to curb weight,
accessory weight, occupant weight and
cargo weight.
Vehicle label:
A label permanently
attached to a vehicle showing original
equipment tire size and the recommended
cold inflation pressure. See “Loading Your
Vehicle” on page 226.
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