wheel size GMC ENVOY XUV 2004 Owner's Manual

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 ªPº 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.(B) Tire Width:The three-digit number indicates the
tire section width in millimeters from sidewall to sidewall.
(C) Aspect Ratio:A two-digit number that indicates
the tire height-to-width measurements. For example, if
the tire size aspect ratio is ª75,º as shown in item ªCº of
the illustration, it would mean that the tire's sidewall is
75% 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
ªRº means radial ply construction; the letter ªDº means
diagonal or bias ply construction; and the letter ªBº
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 ªAº to ªZº. Passenger (P-Metric) Tire
5-56

(A) Light Truck (LT-Metric) Tire:The United States
version of a metric tire sizing system. The letter ªLTº 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.
(C) Aspect Ratio:A two-digit number that indicates
the tire height-to-width measurements. For example, if
the tire size aspect ratio is ª75,º as shown in item ªCº of
the illustration, it would mean that the tire's sidewall is
75% 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
ªRº means radial ply construction; the letter ªDº means
diagonal or bias ply construction; and the letter ªBº
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 ªAº to ªZº. The light truck tire size example
above shows dual or single tire con®gurations.Tire Terminology and De®nitions
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, power steering,
power brakes, power windows, power seats, and air
conditioning.
Aspect Ratio:The relationship of a tire's height to
its width. Light Truck (LT-Metric) Tire
5-57

Buying New Tires
To ®nd out what kind and size of tires you need, look at
the Certi®cation/Tire label or the Tire and Loading
Information label. For examples of these labels and their
location on your vehicle, see
Loading Your Vehicle on
page 4-49.
The tires installed on your vehicle when it was new had
a Tire Performance Criteria Speci®cation (TPC Spec)
number on each tire's sidewall. When you get new tires,
General Motors recommends that you get tires with
that same TPC Spec number. That way your vehicle will
continue to have tires that are designed to give proper
endurance, handling, speed rating, load range, traction,
ride and other things during normal service on your
vehicle. If your tires have an all-season tread design,
the TPC number will be followed by an ªMSº (for mud
and snow).
If you ever replace your tires with those not having a
TPC Spec number, make sure they are the same size,
load range, speed rating and construction type (bias,
bias-belted or radial) as your original tires.
{CAUTION:
Mixing tires could cause you to lose control
while driving. If you mix tires of different sizes
or types (radial and bias-belted tires) the
vehicle may not handle properly, and you
could have a crash. Using tires of different
sizes may also cause damage to your vehicle.
Be sure to use the same size and type tires on
all wheels.
{CAUTION:
If you use bias-ply tires on your vehicle, the
wheel rim ¯anges could develop cracks after
many miles of driving. A tire and/or wheel
could fail suddenly, causing a crash. Use only
radial-ply tires with the wheels on your vehicle.
5-64

Tire Chains
{CAUTION:
Don't use tire chains. There's not enough
clearance. Tire chains used on a vehicle
without the proper amount of clearance can
cause damage to the brakes, suspension or
other vehicle parts. The area damaged by the
tire chains could cause you to lose control of
your vehicle and you or others may be injured
in a crash. Use another type of traction device
only if its manufacturer recommends it for use
on your vehicle and tire size combination and
road conditions. Follow that manufacturer's
instructions. To help avoid damage to your
vehicle, drive slowly, readjust or remove the
device if it's contacting your vehicle, and don't
spin your wheels. If you do ®nd traction
devices that will ®t, install them on the
rear tires.
Accessory In¯ator
Your vehicle may be equipped with an air in¯ator
system. You can in¯ate things like basketballs and
bicycle tires. Also, you can use it to bring your tire
pressure up to the proper pressure. It is not designed to
in¯ate large objects which will require more than ®ve
minutes to in¯ate, such as an air mattress.
The air in¯ator is located in
the rear compartment on
the driver's side of the
vehicle behind an
access cover.
Pull the tab on the cover to access the in¯ator.
The air in¯ator kit may be located in the glove box. The
kit includes a 22 ft (6.7 m) hose with three nozzle
adapters.
5-68

Sun Visors.....................................................2-21
Sunroof.........................................................2-54
T
Tachometer....................................................3-33
Tailgate.........................................................2-13
TAILGATE AJAR.............................................3-60
TAILGATE GLASS DOWN................................3-60
TAILGATE OPEN............................................3-60
Taillamps
Turn Signal Lamps......................................5-49
Testing the Alarm............................................2-23
Theft-Deterrent, Radio....................................3-117
Theft-Deterrent Systems...................................2-22
Content Theft-Deterrent................................2-22
Passlock
ž...................................................2-23
Throttle, Adjustable..........................................2-27
TIGHTEN FUEL CAP......................................3-60
Tilt Wheel........................................................ 3-6
Tire Sidewall Labeling......................................5-52
Tire Size.......................................................5-56
Tire Terminology and De®nitions........................5-57
Tires.............................................................5-52
Buying New Tires........................................5-64
Chains.......................................................5-68
Changing a Flat Tire....................................5-71
If a Tire Goes Flat.......................................5-70
In¯ation - Tire Pressure................................5-60Tires (cont.)
Inspection and Rotation................................5-61
Spare Tire..................................................5-83
Uniform Tire Quality Grading.........................5-65
Wheel Alignment and Tire Balance.................5-66
Wheel Replacement.....................................5-66
When It Is Time for New Tires......................5-63
To Use the Engine Coolant Heater....................2-28
Top Strap......................................................1-38
Top Strap Anchor Location...............................1-40
Torque Lock...................................................2-37
Total Weight on Your Vehicle's Tires..................4-60
Towing
Recreational Vehicle.....................................4-45
Towing a Trailer..........................................4-56
Your Vehicle...............................................4-45
Traction
Assist System (TAS)...................................... 4-8
Trailer Brakes.................................................4-61
Trailer Wiring Harness.....................................4-66
Transfer Case................................................5-46
Transmission
Fluid, Automatic...........................................5-21
Transmission Operation, Automatic....................2-29
Transmission, Transaxle, Transfer Case Unit
Repair Manual............................................7-11
Transportation Options...................................... 7-8
Traveling to Remote Areas...............................4-17
Trip Information..............................................3-47
Trip Odometer................................................3-32
14