2020 CADILLAC CT6 wheel size

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-13566829) -
2020 - CRC - 6/11/19
332 VEHICLE CARE
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. SeeTire
Rotation 0329 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
(Continued)
Warning (Continued)
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
(Continued)
Warning (Continued)
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
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. See Tire Pressure Monitor
Operation 0325.
The Tire and Loading Information
label indicates the original
equipment tires on the vehicle.
See Vehicle Load Limits 0179.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-13566829) -
2020 - CRC - 6/11/19
VEHICLE CARE 333
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 0331 and
Accessories and Modifications 0272.
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.
Quality grades can be found where
applicable on the tire sidewall
between tread shoulder and
maximum section width. For
example:
Treadwear 200 Traction AA
Temperature A
All Passenger Car Tires Must
Conform to Federal Safety
Requirements In Addition To
These Grades.
Treadwear
The treadwear grade is a
comparative rating based on the
wear rate of the tire when tested
under controlled conditions on a
specified government test course.
For example, a tire graded
150 would wear one and one-half
(1½) times as well on the

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-13566829) -
2020 - CRC - 6/11/19
VEHICLE CARE 335
Wheel Replacement
Replace any wheel that is bent,
cracked, or badly rusted or corroded.
If wheel nuts keep coming loose, the
wheel, wheel bolts, and wheel nuts
should be replaced. If the wheel leaks
air, replace it. Some aluminum wheels
can be repaired. See your dealer if any
of these conditions exist.
Your dealer will know the kind of
wheel that is needed.
Each new wheel should have the same
load-carrying capacity, diameter,
width, offset, and be mounted the
same way as the one it replaces.
Replace wheels, wheel bolts, wheel
nuts, or Tire Pressure Monitor System
(TPMS) sensors with new GM original
equipment parts.
{Warning
Using the wrong replacement
wheels, wheel bolts, or wheel nuts
can be dangerous. It could affect
the braking and handling of the(Continued)
Warning (Continued)
vehicle. Tires can lose air, and
cause loss of control, causing a
crash. Always use the correct wheel,
wheel bolts, and wheel nuts for
replacement.
Caution
The wrong wheel can also cause
problems with bearing life, brake
cooling, speedometer or odometer
calibration, headlamp aim, bumper
height, vehicle ground clearance,
and tire or tire chain clearance to
the body and chassis.
Used Replacement Wheels
{Warning
Replacing a wheel with a used one
is dangerous. How it has been used
or how far it has been driven may(Continued)
Warning (Continued)
be unknown. It could fail suddenly
and cause a crash. When replacing
wheels, use a new GM original
equipment wheel.
Tire Chains
Caution
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(Continued)

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-13566829) -
2020 - CRC - 6/11/19
342 VEHICLE CARE
to a cargo tie-down (1) in the
rear of the vehicle and go to
Step 8.
5. Route the loop end of thestrap (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 strapthrough the wheel.
9. Attach the hook to the other 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.
Compact Spare Tire
{Warning
Driving with more than one
compact spare tire at a time could
result in loss of braking and
handling. This could lead to a crash
and you or others could be injured.
Use only one compact spare tire at
a time.
If this vehicle has a compact spare
tire, it was fully inflated when new;
however, it can lose air over time.
Check the inflation pressure regularly.
It should be 420 kPa (60 psi).
Caution
Exceeding the 80 km/h (50 mph)
maximum speed when a compact
spare assembly is installed can
damage the vehicle’s driveline
components.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-13566829) -
2020 - CRC - 6/11/19
INDEX 409
Storage Areas (cont'd)Center Console . . . . . . . . . . . . . . . . . . . . 100
Convenience Net . . . . . . . . . . . . . . . . . . 101
Glove Box . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Instrument Panel . . . . . . . . . . . . . . . . . . . 98
Storage Compartments . . . . . . . . . . . . . . 98
Struts Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296
Stuck Vehicle . . . . . . . . . . . . . . . . . . . . . . . 179
Summer Tires . . . . . . . . . . . . . . . . . . . . . . . 317
Sun Visors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Sunshade Rear Window . . . . . . . . . . . . . . . . . . . . . . . . 40
Super Cruise . . . . . . . . . . . . . . . . . . . . . . . . 220
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
System Brake Pad Life . . . . . . . . . . . . . . . . . . . . . 291
Engine Air Filter Life . . . . . . . . . . . . . 281
Forward Collision Alert (FCA) . . . . 244
Infotainment . . . . . . . . . . . . . . . . . 157, 389
Night Vision . . . . . . . . . . . . . . . . . . . . . . . 250
Systems
Driver Assistance . . . . . . . . . . . . . . . . . 234T
Tachometer . . . . . . . . . . . . . . . . . . . . . . . . . 116
Text Telephone (TTY) Users . . . . . . . 378
Theft-Deterrent Systems . . . . . . . . . . . . 32Immobilizer . . . . . . . . . . . . . . . . . . . . . . . . . 32
Thigh Support Adjustment . . . . . . . . . . 47
Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315 All-Season . . . . . . . . . . . . . . . . . . . . . . . . . 316
Buying New Tires . . . . . . . . . . . . . . . . . 331
Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
Changing . . . . . . . . . . . . . . . . . . . . . . . . . . 337
Compact Spare . . . . . . . . . . . . . . . . . . . . 342
Designations . . . . . . . . . . . . . . . . . . . . . . 319
Different Size . . . . . . . . . . . . . . . . . . . . . . 333
If a Tire Goes Flat . . . . . . . . . . . . . . . . 336
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . 329
Low Profile . . . . . . . . . . . . . . . . . . . . . . . . 317
Pressure . . . . . . . . . . . . . . . . . . . . . . 322, 324
Pressure Light . . . . . . . . . . . . . . . . . . . . . 129
Pressure Monitor Operation . . . . . . 325
Pressure Monitor System . . . . . . . . 324
Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . 329
Sidewall Labeling . . . . . . . . . . . . . . . . . 317
Terminology and Definitions . . . . 320
Uniform Tire Quality Grading . . . . 333
Wheel Alignment and TireBalance . . . . . . . . . . . . . . . . . . . . . . . . . . 334 Tires (cont'd)
Wheel Replacement . . . . . . . . . . . . . . 335
When It Is Time for New
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316
Top Tier Fuel . . . . . . . . . . . . . . . . . . . . . . . . 258
Towing Driving Characteristics . . . . . . . . . . . 262
Equipment . . . . . . . . . . . . . . . . . . . . . . . . 267
General Information . . . . . . . . . . . . . . 262
Recreational Vehicle . . . . . . . . . . . . . . 348
Trailer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346
Track Events and Competitive
Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Traction Control System(TCS)/StabiliTrak Light . . . . . . . . . 128
Off Light . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Traction Control/Electronic Stability Control . . . . . . . . . . . . . . . . . . . 203
Trailer Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266
Transmission Automatic . . . . . . . . . . . . . . . . . . . . . . . . . 193
Fluid, Automatic . . . . . . . . . . . . . . . . . . 281
Transportation Program, Courtesy . . . . . . . . . . . . . . . . . . . . . . . . . . . 382

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-13566829) -
2020 - CRC - 6/11/19
410 INDEX
Trip Odometer . . . . . . . . . . . . . . . . . . . . . . 116
Trunk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Turn and Lane-Change Signals . . . . 153
U
Uniform Tire Quality Grading . . . . . . 333
Universal Remote System . . . . . . . . . . 145Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Programming . . . . . . . . . . . . . . . . . . . . . . 145
Using This Manual . . . . . . . . . . . . . . . . . . . . 2
V
Vehicle Alarm System . . . . . . . . . . . . . . . . . . . . . . . 30
Automatic Hold Light . . . . . . . . . . . . 127
Canadian Owners . . . . . . . . . . . . . . . . . . . . 2
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Identification Number (VIN) . . . . . 372
Load Limits . . . . . . . . . . . . . . . . . . . . . . . 179
Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Personalization . . . . . . . . . . . . . . . . . . . 140
Remote Start . . . . . . . . . . . . . . . . . . . . . . . . 17
Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Speed Messages . . . . . . . . . . . . . . . . . . . 139
Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346
Vehicle Ahead Indicator . . . . . . . . . . . . 127 Vehicle Care
Tire Pressure . . . . . . . . . . . . . . . . . . . . . . 322
Vehicle Data Recording and Privacy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387
Vehicle Hold Automatic . . . . . . . . . . . . . . . . . . . . . . . . . 202
Vehicle Hold (AVH)
Automatic . . . . . . . . . . . . . . . . . . . . . . . . . 202
Ventilation, Air . . . . . . . . . . . . . . . . . . . . . 169
Video Recorder . . . . . . . . . . . . . . . . . . . . . . 256
Visors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Voltmeter Gauge . . . . . . . . . . . . . . . . . . . . 120
W
Warning Brake System Light . . . . . . . . . . . . . . . 125
Caution and Danger . . . . . . . . . . . . . . . . . 2
Warning Lights, Gauges, and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Warnings Hazard Flashers . . . . . . . . . . . . . . . . . . . 152
Washer Fluid . . . . . . . . . . . . . . . . . . . . . . . . 289
Wheels Alignment and Tire Balance . . . . . 334
Different Size . . . . . . . . . . . . . . . . . . . . . . 333
Replacement . . . . . . . . . . . . . . . . . . . . . . 335
When It Is Time for New Tires . . . . 330
Where to Put the Restraint . . . . . . . . . 83 Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Windshield Replacement . . . . . . . . . . . . . . . . . . . . . . 295
Wiper/Washer . . . . . . . . . . . . . . . . . . . . . 104
Winter Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Winter Tires . . . . . . . . . . . . . . . . . . . . . . . . . 316
Wiper Blade Replacement . . . . . . . . . . 295
Wireless Charging . . . . . . . . . . . . . . . . . . 107