2018 CADILLAC CT6 wheel size

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/15/17
356 VEHICLE CARE
performance, ride and handling,
traction control, and tire pressure
monitoring performance. GM's
TPC Spec number is molded onto
the tire's sidewall near the tire
size. If the tires have an all-season
tread design, the TPC Spec
number will be followed by MS for
mud and snow. SeeTire Sidewall
Labeling 0342, for additional
information.
GM recommends replacing worn
tires in complete sets of four.
Uniform tread depth on all tires
will help to maintain the
performance of the vehicle.
Braking and handling performance
may be adversely affected if all the
tires are not replaced at the same
time. If proper rotation and
maintenance have been done, all
four tires should wear out at
about the same time. See Tire
Rotation 0353 for information on
proper tire rotation. However, if it is necessary to replace only one
axle set of worn tires, place the
new tires on the rear axle.
Winter tires with the same speed
rating as the original equipment
tires may not be available for H, V,
W, and ZR speed rated tires. Never
exceed the winter tire's maximum
speed capability when using
winter tires with a lower speed
rating.
{Warning
Tires could explode during
improper service. Attempting to
mount or dismount a tire could
cause injury or death. Only your
dealer or authorized tire service
center should mount or
dismount the tires.
{Warning
Mixing tires of different sizes (other
than those originally installed on
the vehicle), brands, or types may
cause loss of control of the vehicle,
resulting in a crash or other vehicle
damage. Use the correct size, brand,
and type of tire on all four wheels.
{Warning
Using bias-ply tires on the
vehicle may cause the wheel rim
flanges to develop cracks after
many miles of driving. A tire
and/or wheel could fail suddenly
and cause a crash. Use only
radial-ply tires with the wheels
on the vehicle.
If the vehicle tires must be
replaced with a tire that does not
have a TPC Spec number, make
sure they are the same size, load

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/15/17
VEHICLE CARE 357
range, speed rating, and
construction (radial) as the
original tires.
Vehicles that have a tire pressure
monitoring system could give an
inaccurate low-pressure warning if
non-TPC Spec rated tires are
installed. SeeTire Pressure Monitor
Operation 0350.
The Tire and Loading Information
label indicates the original
equipment tires on the vehicle.
See Vehicle Load Limits 0213.
Different Size Tires and
Wheels
If wheels or tires are installed that are
a different size than the original
equipment wheels and tires, vehicle
performance, including its braking,
ride and handling characteristics,
stability, and resistance to rollover
may be affected. If the vehicle has
electronic systems such as antilock
brakes, rollover airbags, traction control, electronic stability control,
or All-Wheel Drive, the performance
of these systems can also be affected.
{Warning
If different sized wheels are used,
there may not be an acceptable
level of performance and safety if
tires not recommended for those
wheels are selected. This increases
the chance of a crash and serious
injury. Only use GM specific wheel
and tire systems developed for the
vehicle, and have them properly
installed by a GM certified
technician.
See Buying New Tires 0355 and
Accessories and Modifications 0298.
Uniform Tire Quality
Grading
The following information relates
to the system developed by the
United States National Highway
Traffic Safety Administration
(NHTSA), which grades tires by treadwear, traction, and
temperature performance. This
applies only to vehicles sold in the
United States. The grades are
molded on the sidewalls of most
passenger car tires. The Uniform
Tire Quality Grading (UTQG)
system does not apply to deep
tread, winter tires, compact spare
tires, tires with nominal rim
diameters of 10 to 12 inches
(25 to 30 cm), or to some
limited-production tires.
While the tires available on
General Motors passenger cars
and light trucks may vary with
respect to these grades, they must
also conform to federal safety
requirements and additional
General Motors Tire Performance
Criteria (TPC) standards.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/15/17
360 VEHICLE CARE
Tire Chains
{Warning
If the vehicle has 265/45R18 size
tires on the rear axle, do not use
tire chains. 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 loss of
control and a crash. Use another
type of traction device only if its
manufacturer recommends it for
the vehicle's tire size combination
and road conditions. Follow that
manufacturer's instructions. To
avoid vehicle damage, drive slow
and readjust or remove the traction
device if it contacts the vehicle. Do
not spin the wheels. If traction
devices are used, install them on
the rear tires.
Caution
If the vehicle is equipped with a tire
size other than 265/45R18 on the
rear, use tire chains only where
legal and only when necessary. Use
low profile chains that add no more
than 10 mm thickness to the tire
tread and inner sidewall. Use chains
that are the proper size for the 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 the chains contact
the 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 the vehicle.
If a Tire Goes Flat
It is unusual for a tire to blow out
while driving, especially if the tires are
maintained properly. SeeTires0340.
If air goes out of a tire, it is much more likely to leak out slowly. But if
there is ever a blowout, here are a few
tips about what to expect and what
to do:
If a front tire fails, the flat tire creates
a drag that pulls the vehicle toward
that side. Take your foot off the
accelerator pedal and grip the steering
wheel firmly. Steer to maintain lane
position, and then gently brake to a
stop, well off the road, if possible.
A rear blowout, particularly on a
curve, acts much like a skid and may
require the same correction as used in
a skid. Stop pressing the accelerator
pedal and steer to straighten the
vehicle. It may be very bumpy and
noisy. Gently brake to a stop, well off
the road, if possible.
{Warning
Driving on a flat tire will cause
permanent damage to the tire.
Re-inflating a tire after it has been
driven on while severely
underinflated or flat may cause a
blowout and a serious crash. Never
(Continued)

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/15/17
372 VEHICLE CARE
17. Lower the jack all the way andremove the jack from under the
vehicle.
18. Tighten the wheel nuts firmly with the wheel wrench.
Storing a Flat or Spare Tire and
Tools
{Warning
Storing a jack, a tire, or other
equipment in the passenger
compartment of the vehicle could
cause injury. In a sudden stop or
collision, loose equipment could
strike someone. Store all these in
the proper place.
To store the flat tire and tools: 1. Open the trunk.
2. Replace the jack and tools as they were, originally, stored in
their container near the
spare tire.
3. Replace the spare tire cover.
4. Place the tire, lying flat, in the rear storage compartment. If there is a loop on the end of
the strap used to secure the flat
tire, go to Step 5. If there is not a
loop, go to Step 8.
5. Route the loop end of the
strap (3) through one of the
cargo tie-downs (1) in the rear of
the vehicle.
6. Route the hook (2) through the loop (3).
7. Pull the strap to tighten it around the cargo tie-down (1).
8. Route the hook end of the strap
through the wheel.
9. Attach the hook to the cargo tie-down in the rear of the
vehicle.
10. Tighten the strap.
The compact spare is for temporary
use only. Replace the compact spare
tire with a full-size tire as soon as
you can.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
INDEX 441
Service Electric Parking BrakeLight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Services Special Application . . . . . . . . . . . . . . . 395
Servicing the Airbag . . . . . . . . . . . . . . . . . 95
Shift Lock Control Function Check, Automatic
Transmission . . . . . . . . . . . . . . . . . . . . . . 327
Shifting Into Park . . . . . . . . . . . . . . . . . . . . . . . . . . 224
Out of Park . . . . . . . . . . . . . . . . . . . . . . . . 225
Side Blind Zone Alert (SBZA) . . . . . . 268
Signals, Turn and Lane-Change . . . . 186
Spare Tire Compact . . . . . . . . . . . . . . . . . . . . . . . . . . . 373
Special Application Services . . . . . . . 395
Specifications and Capacities . . . . . . 404
Speedometer . . . . . . . . . . . . . . . . . . . . . . . . 134
Sport Mode Light . . . . . . . . . . . . . . . . . . . 146
StabiliTrak OFF Light . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Start Assist, Hill . . . . . . . . . . . . . . . . . . . . 237
Start Vehicle, Remote . . . . . . . . . . . . . . . 42
Starter Switch Check . . . . . . . . . . . . . . . 326
Starting the Engine . . . . . . . . . . . .218, 221
Status Screens Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . 275 Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Heated Wheel . . . . . . . . . . . . . . . . . . . . . 119
Wheel Adjustment . . . . . . . . . . . . . . . . 119
Wheel Controls . . . . . . . . . . . . . . . . . . . 119
Storage Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Storage Areas
Armrest . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Center Console . . . . . . . . . . . . . . . . . . . . 116
Convenience Net . . . . . . . . . . . . . . . . . . 117
Glove Box . . . . . . . . . . . . . . . . . . . . . . . . . 115
Instrument Panel . . . . . . . . . . . . . . . . . 115
Storage Compartments . . . . . . . . . . . . . 115
Storing the Tire Sealant and Compressor Kit . . . . . . . . . . . . . . . . . . . . 368
Struts
Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328
Stuck Vehicle . . . . . . . . . . . . . . . . . . . . . . . 212
Summer Tires . . . . . . . . . . . . . . . . . . . . . . . 342
Sun Visors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Sunshade Rear Window . . . . . . . . . . . . . . . . . . . . . . . . 60
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
System Forward Collision Alert (FCA) . . . . 260
Infotainment . . . . . . . . . . . . . . . . . 190, 420 System (cont'd)
Night Vision . . . . . . . . . . . . . . . . . . . . . . . 266
Systems Driver Assistance . . . . . . . . . . . . . . . . . 253
T
Tachometer . . . . . . . . . . . . . . . . . . . . . . . . . 134
Text Telephone (TTY) Users . . . . . . . 410
Theft-Deterrent Systems . . . . . . . . . . . . 53Immobilizer . . . . . . . . . . . . . . . . . . . . . . . . . 53
Thigh Support Adjustment . . . . . . . . . . 68
Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340 All-Season . . . . . . . . . . . . . . . . . . . . . . . . . 341
Buying New Tires . . . . . . . . . . . . . . . . . 355
Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360
Changing . . . . . . . . . . . . . . . . . . . . . . . . . . 368
Compact Spare . . . . . . . . . . . . . . . . . . . . 373
Designations . . . . . . . . . . . . . . . . . . . . . . 344
Different Size . . . . . . . . . . . . . . . . . . . . . . 357
If a Tire Goes Flat . . . . . . . . . . . . . . . . 360
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . 353
Low Profile . . . . . . . . . . . . . . . . . . . . . . . . 342
Pressure . . . . . . . . . . . . . . . . . . . . . . 347, 349
Pressure Light . . . . . . . . . . . . . . . . . . . . . 149
Pressure Monitor Operation . . . . . . 350
Pressure Monitor System . . . . . . . . 349
Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . 353
Sealant and Compressor Kit . . . . . 362

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
INDEX 443
WarningsHazard Flashers . . . . . . . . . . . . . . . . . . . 186
Washer Fluid . . . . . . . . . . . . . . . . . . . . . . . . 322
Wheels Alignment and Tire Balance . . . . . 359
Different Size . . . . . . . . . . . . . . . . . . . . . . 357
Replacement . . . . . . . . . . . . . . . . . . . . . . 359
When It Is Time for New Tires . . . . 355
Where to Put the Restraint . . . . . . . . 102
Wi-Fi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Windshield Replacement . . . . . . . . . . . . . . . . . . . . . . 328
Wiper/Washer . . . . . . . . . . . . . . . . . . . . . 120
Winter
Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Winter Driving Mode Light . . . . . . . . 146
Winter Tires . . . . . . . . . . . . . . . . . . . . . . . . . 341
Wiper Blade Replacement . . . . . . . . . . 327
Wireless Charging . . . . . . . . . . . . . . . . . . 124