2008 GMC SIERRA wheel size

Tire Chains
{CAUTION:
If your vehicle has dual wheels or P265/65R18,
P275/55R20 or LT265/70R17 size tires, do not
use tire chains. They can damage your vehicle
because there is 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
CAUTION: (Continued)
CAUTION: (Continued)
vehicle, drive slowly, readjust, or remove the
device if it is contacting your vehicle, and do
not spin your vehicle’s wheels.
If you do nd traction devices that will t,
install them on the rear tires.
Notice:If your vehicle does not have dual wheels
and has a tire size other than P265/65R18,
P275/55R20 or LT265/70R17, use tire chains only
where legal and only when you must. Use chains
that are the proper size for your tires. Install them on
the tires of the rear axle. Do not use chains on the
tires of the front axle. Tighten them as tightly as
possible with the ends securely fastened. Drive
slowly and follow the chain manufacturer’s
instructions. If you can hear the chains contacting
your vehicle, stop and retighten them. If the contact
continues, slow down until it stops. Driving too
fast or spinning the wheels with chains on will
damage your vehicle.
5-90

Spare Tire
Your vehicle, when new, had a fully-inated spare tire.
A spare tire may lose air over time, so check its
ination pressure regularly. SeeInflation - Tire Pressure
on page 5-74andLoading Your Vehicle on page 4-36
for information regarding proper tire ination and loading
your vehicle. For instruction on how to remove, install
or store a spare tire, seeRemoving the Flat Tire and
Installing the Spare Tire on page 5-98andStoring a Flat
or Spare Tire and Tools on page 5-108.
Notice:If your vehicle has four-wheel drive and the
different size spare tire is installed on your vehicle,
do not drive in four-wheel drive until you can have
your at tire repaired and/or replaced. You could
damage your vehicle, and the repair costs would not
be covered by your warranty. Never use four-wheel
drive when the different size spare tire is installed on
your vehicle.
Your vehicle may have a different size spare tire than
the road tires originally installed on your vehicle.
This spare tire was developed for use on your vehicle,
so it is all right to drive on it. If your vehicle has
four-wheel drive and the different size spare tire is
installed, keep the vehicle in two-wheel drive.After installing the spare tire on your vehicle, you should
stop as soon as possible and make sure the spare tire
is correctly inated. Have the damaged or at road tire
repaired or replaced as soon as you can and installed
back onto your vehicle. This way, the spare tire will be
available in case you need it again.
Do not mix tires and wheels of different sizes, because
they will not t. Keep your spare tire and its wheel
together. If your vehicle has a spare tire that does not
match your vehicle’s original road tires and wheels
in size and type, do not include the spare in the
tire rotation.
Appearance Care
Interior Cleaning
Your vehicle’s interior will continue to look its best if it is
cleaned often. Although not always visible, dust and
dirt can accumulate on your upholstery. Dirt can damage
carpet, fabric, leather, and plastic surfaces. Regular
vacuuming is recommended to remove particles from
your upholstery. It is important to keep your upholstery
from becoming and remaining heavily soiled. Soils should
be removed as quickly as possible. Your vehicle’s interior
may experience extremes of heat that could cause stains
to set rapidly.
5-112

Tilt Wheel........................................................ 3-9
Time, Setting..................................................3-81
Tire
Pressure Light.............................................3-47
Tires.............................................................5-66
Aluminum or Chrome-Plated Wheels,
Cleaning...............................................5-118
Buying New Tires........................................5-84
Chains.......................................................5-90
Changing a Flat Tire....................................5-92
Cleaning...................................................5-119
Different Size..............................................5-86
Dual Tire Operation.....................................5-76
If a Tire Goes Flat.......................................5-91
Ination - Tire Pressure................................5-74
Inspection and Rotation................................5-81
Installing the Spare Tire................................5-98
Pressure Monitor Operation...........................5-78
Pressure Monitor System..............................5-76
Removing the Flat Tire.................................5-98
Removing the Spare Tire and Tools...............5-93
Secondary Latch System............................5-105
Spare Tire................................................5-112
Storing a Flat or Spare Tire and Tools..........5-108
Tire Sidewall Labeling..................................5-67
Tire Terminology and Denitions....................5-71
Uniform Tire Quality Grading.........................5-86
Wheel Alignment and Tire Balance.................5-88Tires (cont.)
Wheel Replacement.....................................5-88
When It Is Time for New Tires......................5-84
Tow/Haul Mode...............................................2-34
Tow/Haul Mode Light.......................................3-53
Towing
Recreational Vehicle.....................................4-50
Towing a Trailer..........................................4-55
Your Vehicle...............................................
4-50
Traction
StabiliTrak
®System....................................... 4-6
Trailer
Recommendations.......................................4-94
Transmission
Fluid, Automatic..................................5-22, 5-25
Transmission Operation, Automatic....................2-28
Trip Odometer................................................3-36
Truck-Camper Loading Information....................4-47
Turn and Lane-Change Signals.........................3-10
Turn Signal/Multifunction Lever........................... 3-9
U
Ultrasonic Rear Parking Assist (URPA)...............2-63
Uniform Tire Quality Grading............................5-86
Universal Home Remote System.......................2-68
Operation...................................................2-69
Using this Manual............................................... iii
13

V
Vehicle
Control........................................................ 4-3
Damage Warnings........................................... iv
Loading......................................................4-36
Symbols......................................................... iv
Vehicle Customization, DIC..............................3-72
Vehicle Data Recording and Privacy..................7-16
Vehicle Identication
Number (VIN)............................................5-121
Service Parts Identication Label..................5-122
Vehicle, Remote Start....................................... 2-7
Ventilation Adjustment......................................3-33
Visors...........................................................2-18
Voltmeter Gage..............................................3-43
W
Warning Lights, Gages and Indicators................3-34
Warnings
DIC Warnings and Messages........................3-63
Hazard Warning Flashers............................... 3-8
Other Warning Devices.................................. 3-8
Safety and Symbols......................................... iii
Vehicle Damage.............................................. ivWheels
Alignment and Tire Balance..........................5-88
Different Size..............................................5-86
Replacement...............................................5-88
Where to Put the Restraint...............................1-44
Windows.......................................................2-15
Manual......................................................2-16
Power........................................................2-16
Sliding Rear................................................2-17
Windshield
Rainsense™ II Wipers..................................3-12
Washer......................................................3-13
Washer Fluid..............................................5-40
Wiper Blade Replacement.............................5-65
Wiper Blades, Cleaning..............................5-117
Wiper Fuses.............................................5-123
Wipers.......................................................3-12
Winter Driving................................................4-31X
XM Radio Messages.....................................3-111
XM™ Satellite Radio Antenna System..............3-126
Y
Your Vehicle and the Environment....................... 6-2
14