tire type GMC SIERRA CLASSIC 2007 Owners Manual

BAND (Alternate Frequency):Alternate
frequency allows the radio to switch to a stronger
station with the same program type. To turn
alternate frequency on, press and hold BAND for
two seconds. AF(alternate frequency) ON will
appear on the display. The radio may switch to
stations with a stronger frequency.
To turn alternate frequency off, press and hold
BAND again for two seconds. AF OFF will appear
on the display. The radio will not switch to
other stations.
This function does not apply for XM™ Satellite
Radio Service.
Setting Preset PTYs (RDS Only)
These buttons have factory PTY presets. Up to
12 PTYs (six FM1 and six FM2), can be
programmed on the six numbered pushbuttons, by
performing the following steps:
1. Press BAND to select FM1 or FM2.
2. Press the TYPE button to activate program
type select mode. TYPE and the last selected
PTY will appear on the display.
3. Turn the TYPE knob or press and release the
TYPE button to select a PTY.4. Press and hold one of the six numbered
pushbuttons until you hear a beep.
Whenever that numbered pushbutton is
pressed, the PTY that was set will return.
5. Repeat the steps for each pushbutton.
RDS Messages
INFO (Information):If the current station has a
message, the information symbol will appear
on the display. Press this button to see the
message. The message may display the artist,
song title, call in phone numbers, etc.
If the entire message is not displayed, parts of the
message will appear every three seconds. To
scroll through the message, press and release the
INFO button. A new group of words will appear
on the display after every press of the button.
Once the complete message has been displayed,
the information symbol will disappear from the
display until another new message is received.
The last message can be displayed by pressing
the INFO button. You can view the last message
until a new message is received or a different
station is tuned to.
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BAND (Alternate Frequency):Alternate
frequency allows the radio to switch to a stronger
station with the same program type. To turn
alternate frequency on, press and hold BAND for
two seconds. AF (alternate frequency) ON will
appear on the display. The radio may switch
to stations with a stronger frequency.
To turn alternate frequency off, press and hold
BAND again for two seconds. AF OFF will appear
on the display. The radio will not switch to
other stations.
This function does not apply for XM™ Satellite
Radio Service.
Setting Preset PTYs (RDS Only)
These buttons have factory PTY presets. Up to
12 PTYs (six FM1 and six FM2), can be
programmed on the six numbered pushbuttons, by
performing the following steps:
1. Press BAND to select FM1 or FM2.
2. Press the TYPE button to activate program
type select mode. TYPE and the last selected
PTY will appear on the display.
3. Turn the TYPE knob or press and release the
TYPE button to select a PTY.4. Press and hold one of the six numbered
pushbuttons until you hear a beep.
Whenever that numbered pushbutton is
pressed, while in PTY select mode, the PTY
that was set will return.
5. Repeat the steps for each pushbutton.
RDS Messages
INFO (Information):If the current station has a
message, the information symbol will appear
on the display. Press this button to see the
message. The message may display the artist,
song title, call in phone numbers, etc.
If the entire message is not displayed, parts of the
message will appear every three seconds. To
scroll through the message, press and release the
INFO button. A new group of words will appear
on the display after every press of the button.
Once the complete message has been displayed,
the information symbol will disappear from the
display until another new message is received.
The last message can be displayed by pressing
the INFO button. You can view the last message
until a new message is received or a different
station is tuned to.
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Seek through the song list by using the SEEK or
TYPE arrows. Seeking past the last saved
track will return to the rst saved track.
To delete tracks from the song list, perform the
following steps:
1. Turn the CD player on.
2. Press the SONG LIST button to turn song list
on. S-LIST will appear on the display.
3. Press either SEEK or TYPE arrow to select
the desired track to be deleted.
4. Press and hold the SONG LIST button for
two seconds. When SONG LIST is pressed,
one beep will be heard immediately. After
two seconds of continuously pressing
the SONG LIST button, two beeps will be
heard to conrm that the track has been
deleted.
After a track has been deleted, the remaining
tracks are moved up the list. When another track
is added to the song list, the track will be
added to the end of the list.To delete the entire song list, perform the following
steps:
1. Turn the CD player on.
2. Press the SONG LIST button to turn song list
on. S-LIST will appear on the display.
3. Press and hold the SONG LIST button for more
than four seconds. One beep will be heard,
followed by two beeps after two seconds, and a
nal beep will be heard after four seconds.
S-LIST EMPTY will appear on the display
indicating the song list has been deleted.
If a CD is ejected, and the song list contains
saved tracks from that CD, those tracks are
automatically deleted from the song list. Any tracks
saved to the song list again are added to the
bottom of the list.
To end song list mode, press the SONG LIST
button. One beep will be heard and S-LIST will be
removed from the display.
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Try not to pass more than one vehicle at a time
on two-lane roads. Reconsider before passing
the next vehicle.
Do not overtake a slowly moving vehicle too
rapidly. Even though the brake lamps are not
ashing, it may be slowing down or starting
to turn.
If you are being passed, make it easy for the
following driver to get ahead of you. Perhaps
you can ease a little to the right.
Loss of Control
Let us review what driving experts say
about what happens when the three control
systems — brakes, steering, and
acceleration — do not have enough friction
where the tires meet the road to do what the
driver has asked.
In any emergency, do not give up. Keep trying to
steer and constantly seek an escape route or
area of less danger.
Skidding
In a skid, a driver can lose control of the vehicle.
Defensive drivers avoid most skids by taking
reasonable care suited to existing conditions, and
by not overdriving those conditions. But skids
are always possible.
The three types of skids correspond to your
vehicle’s three control systems. In the braking skid,
your wheels are not rolling. In the steering or
cornering skid, too much speed or steering in a
curve causes tires to slip and lose cornering force.
And in the acceleration skid, too much throttle
causes the driving wheels to spin.
A cornering skid is best handled by easing your
foot off the accelerator pedal.
If you have the Traction Assist System (TAS),
remember: It helps avoid only the acceleration
skid. SeeTraction Assist System (TAS) on
page 363. If you do not have this system, or if the
system is off, then an acceleration skid is also
best handled by easing your foot off the
accelerator pedal.
371

20-Inch Tires
If your vehicle has the optional 20-inch
P275/55R20 size tires, they are classied as
touring tires and are designed for on road use. The
low-prole, wide tread design is not recommended
for “off-road” driving or commercial uses such
as snow plowing. SeeOff-Road Driving on
page 372andAdding a Snow Plow or Similar
Equipment on page 416for additional information.
Tire Sidewall Labeling
Useful information about a tire is molded into the
sidewall. The following illustrations are examples
of a typical P-Metric and a LT-Metric tire sidewall.
(A) Tire Size:The tire size code is a combination
of letters and numbers used to dene a particular
tire’s width, height, aspect ratio, construction
type, and service description. See the “Tire Size”
illustration later in this section for more detail.
Passenger (P-Metric) Tire
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(B) TPC Spec (Tire Performance Criteria
Specication):Original equipment tires designed
to GM’s specic tire performance criteria have
a TPC specication code molded onto the sidewall.
GM’s TPC specications meet or exceed all
federal safety guidelines.
(C) DOT (Department of Transportation):The
Department of Transportation (DOT) code
indicates that the tire is in compliance with the
U.S. Department of Transportation Motor Vehicle
Safety Standards.
(D) Tire Identication Number (TIN):The letters
and numbers following DOT code are the Tire
Identication Number (TIN). The TIN shows
the manufacturer and plant code, tire size, and
date the tire was manufactured. The TIN is
molded onto both sides of the tire, although only
one side may have the date of manufacture.(E) Tire Ply Material:The type of cord and
number of plies in the sidewall and under
the tread.
(F) Uniform Tire Quality Grading (UTQG):Tire
manufacturers are required to grade tires
based on three performance factors: treadwear,
traction, and temperature resistance. For more
information, seeUniform Tire Quality Grading on
page 559.
(G) Maximum Cold Ination Load
Limit:Maximum load that can be carried and the
maximum pressure needed to support that load.
For information on recommended tire pressure see
Ination - Tire Pressure on page 551andLoading
Your Vehicle on page 409.
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(A) Tire Size:The tire size code is a combination
of letters and numbers used to dene a particular
tire’s width, height, aspect ratio, construction
type, and service description. See the “Tire Size”
illustration later in this section for more detail.(B) TPC Spec (Tire Performance Criteria
Specication):Original equipment tires designed
to GM’s specic tire performance criteria have
a TPC specication code molded onto the sidewall.
GM’s TPC specications meet or exceed all
federal safety guidelines.
(C) Dual Tire Maximum Load:Maximum load
that can be carried and the maximum pressure
needed to support that load when used in a dual
conguration. For information on recommended
tire pressure seeInation - Tire Pressure on
page 551andLoading Your Vehicle on page 409.
(D) DOT (Department of Transportation):The
Department of Transportation (DOT) code
indicates that the tire is in compliance with the
U.S. Department of Transportation Motor Vehicle
Safety Standards.
(E) Tire Identication Number (TIN):The letters
and numbers following DOT code are the Tire
Identication Number (TIN). The TIN shows
the manufacturer and plant code, tire size, and
date the tire was manufactured. The TIN is
molded onto both sides of the tire, although only
one side may have the date of manufacture.
Light Truck (LT-Metric) Tire
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(F) Tire Ply Material:The type of cord and
number of plies in the sidewall and under
the tread.
(G) Single Tire Maximum Load:Maximum load
that can be carried and the maximum pressure
needed to support that load when used as a
single. For information on recommended
tire pressure seeInation - Tire Pressure on
page 551andLoading Your Vehicle on page 409.
Tire Size
The following examples show the different parts of
a tire size.(A) Passenger (P-Metric) Tire:The United States
version of a metric tire sizing system. The letter P
as the rst character in the tire size means a
passenger vehicle tire engineered to standards set
by the U.S. Tire and Rim Association.
(A) Light Truck (LT-Metric) Tire:The United
States version of a metric tire sizing system. The
letters LT as the rst two characters in the tire
size means a light truck tire engineered to
standards set by the U.S. Tire and Rim
Association.
(B) Tire Width:The three-digit number indicates
the tire section width in millimeters from sidewall
to sidewall.
Passenger (P-Metric) Tire
Light Truck (LT-Metric) Tire
547

(C) Aspect Ratio:A two-digit number that
indicates the tire height-to-width measurements.
For example, if the tire size aspect ratio is 75, as
shown in item C of the light truck (LT-Metric) tire
illustration, it would mean that the tire’s sidewall is
75 percent as high as it is wide.
(D) Construction Code:A letter code is used to
indicate the type of ply construction in the tire.
The letter R means radial ply construction;
the letter D means diagonal or bias ply
construction; and the letter B means belted-bias
ply construction.
(E) Rim Diameter:Diameter of the wheel in
inches.
(F) Service Description:The service description
indicates the load range and speed rating of a
tire. The load index can range from 1 to 279.
Speed ratings range from A to Z.Tire Terminology and Denitions
Air 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 combined
weight of optional accessories. Some examples of
optional accessories are, automatic transmission/
transaxle, power steering, power brakes, power
windows, power seats, 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 reinforcing
materials.
Bead:The tire bead contains steel wires wrapped
by steel cords that hold the tire onto the rim.
Bias Ply Tire:A pneumatic tire in which the plies
are laid at alternate angles less than 90 degrees
to the centerline of the tread.
548

How to Check
Use a good quality pocket-type gage to check
tire pressure. You cannot tell if your tires are
properly inated simply by looking at them.
Radial tires may look properly inated even when
they’re underinated. Check the tire’s ination
pressure when the tires are cold. Cold means your
vehicle has been sitting for at least three hours
or driven no more than 1 mile (1.6 km).
Remove the valve cap from the tire valve stem.
Press the tire gage rmly onto the valve to
get a pressure measurement. If the cold tire
ination pressure matches the recommended
pressure on the Tire and Loading Information
label, no further adjustment is necessary. If the
ination pressure is low, add air until you reach the
recommended amount.
If you overll the tire, release air by pushing on
the metal stem in the center of the tire valve.
Recheck the tire pressure with the tire gage.
Be sure to put the valve caps back on the valve
stems. They help prevent leaks by keeping out dirt
and moisture.
Dual Tire Operation
When the vehicle is new, or whenever a wheel,
wheel bolt or wheel nut is replaced, check the
wheel nut torque after 100, 1,000 and 6,000 miles
(160, 1 600 and 10 000 km) of driving. For proper
torque and wheel nut tightening information, see
Removing the Spare Tire and Tools on page 566.
The outer tire on a dual wheel setup generally
wears faster than the inner tire. Your tires will wear
more evenly and last longer if you rotate the
tires periodically, seeTire Inspection and Rotation
on page 553. Also seeScheduled Maintenance
(Gasoline Engine) on page 617.
{CAUTION:
If you operate your vehicle with a tire
that is badly underinated, the tire can
overheat. An overheated tire can lose air
suddenly or catch re. You or others
could be injured. Be sure all tires
(including the spare) are properly inated.
SeeInation - Tire Pressure on page 551, for
information on proper tire ination.
552