MERCEDES-BENZ GLE COUPE 2023 Owners Manual

Tire pressure loss warning system

qFunction of the tire pressure loss warning sys-
tem
The tire pressure loss warning system warns the driver by means of display messages when there
is a severe tire pressure loss.
System limits
The system may be impaired or may not function particularly in the following situations:
= incorrect reference values were taught in
= sudden pressure loss caused by a foreign
object penetrating the tire, for example
= an even pressure loss on more than one tire
occurs
The system has a restricted or delayed function particularly in the following situations:
= poor ground conditions, e.g. snow or gravel
= driving with snow chains
= when adopting a very sporty driving style with
high cornering speeds or sudden acceleration
= driving with a high load
The tire pressure loss warning system is only an
aid. It is the driver\bs responsibility to set the tire
pressure to the recommended cold tire pressure
suitable for the operating situation and to check it.
Be sure to also observe the following further rela-
ted subjects:
= Notes on tire pressure (  page 353)
= Display messages about the tires
(  page 451)

q Restarting the tire pressure loss warning sys-
tem
Requirements
= The recommended tire pressure is correctly
set for the respective operating status on each
of the four wheels (  page 353).
Restart the tire pressure loss warning system in the following situations:
= The tire pressure has changed.
= The wheels or tires have been changed or
newly "Ntted.Driver\bs display:
4 © 5
ServiceSelect Tire Pressure and con"Nrm with v.
The Run Flat Indicator Active message is
shown in the driver\bs display.To initiate a restart, press v on the steer-
ing wheel.
The Are the current pressure values OK"
message is shown in the driver\bs display.Select Yes.To con"Nrm restart, press v on the steering
wheel.
The Run Flat Indicator Restarted message is
shown in the driver\bs display.
Be sure to also observe the following further rela-
ted subjects:
= Notes on tire pressure (  page 353)
Wheels and tires359

Loading the vehicle
Notes on the Tire and Loading Information placard
&WARNING Risk of accident from overloa-
ded tires
Overloaded tires may overheat and burst as a
consequence. Overloaded tires can also
impair the steering and handling characteris-
tics and lead to brake failure.
Observe the load rating of the tires.The load rating must be at least half the
permissible axle load of the vehicle.Never overload the tires by exceeding
the maximum load.
The Tire and Loading Information placard is on the
B-pillar on the driver\bs side of the vehicle.
1Tire and Loading Information placard\bThe data shown in the illustration is example
data.
The Tire and Loading Information placard shows
the following information:
= Maximum number of seats 2 according to
the maximum number of people permitted to
travel in the vehicle.
360Wheels and tires

=Maximum permissible load 3 comprises the
gross weight of all vehicle occupants, load and luggage.
= Recommended tire pressures 1 for cold
tires. The recommended tire pressures are
valid for the maximum permissible load and up
to the maximum permissible vehicle speed.
Please also note: = Information on permissible weights and loads
on the vehicle identi"Ncation plate
(  page 388).
= Information on tire pressure in the tire pres-
sure table (  page 355).
Further related subjects:
= Determining the maximum permissible load
(  page 361)
= Notes on tire pressure (  page 353).
Steps for Determining Correct Load Limit
The following steps have been developed as
required of all manufacturers under Title 49, Code
of U.S. Federal Regulations, Part 575, pursuant to
the "National Tra"Pc and Motor Vehicle Safety Act
of 1966".(1): Locate the statement !

Further related subjects:
= Calculation example for determining the maxi-
mum load (  page 362)
= Tire and Loading Information placard
(  page 360)
= Tire pressure table (  page 355)
= Vehicle identi"Ncation plate ( page 388)Calculation example for determining the maximum
load
The following table shows examples of how to cal-
culate total and load capacities with varying seat-
ing con"Ngurations and di"Merent numbers and
sizes of occupants. The following examples use a
maximum load of 1500 lbs (680 kg). This is for
illustration purposes only. Make sure you are
using the actual load limit for your vehicle stated
on your vehicle\bs Tire and Loading Information
placard (  page 360).
The higher the weight of all the occupants, the
smaller the maximum load for luggage.
Step 1
Example 1Example 2Combined maximum weight of occupants and
load (data from the Tire and Loading Information
placard)1500 lbs (680 kg)1500 lbs (680 kg)362Wheels and tires

Step 2Example 1Example 2Number of people in the vehicle (driver and occu-pants)51Distribution of the occupantsFront: 2
Rear: 3Front: 1Weight of occupantsOccupant 1: 150 lbs (68 kg)
Occupant 2: 180 lbs (82 kg)
Occupant 3: 160 lbs (73 kg)
Occupant 4: 140 lbs (63 kg)
Occupant 5: 120 lbs (54 kg)Occupant 1: 200 lbs (91 kg)Total weight of all occupants750 lbs (340 kg)200 lbs (91 kg)
Step 3
Example 1Example 2Permissible load (maximum gross vehicle weight rating from the Tire and Loading Information plac-
ard minus the gross weight of all occupants)1500 lbs (680 kg)

Tire labeling
Overview of tire labeling
1Uniform Tire Quality Grading Standards2DOT (Department of Transportation), (TIN)
Tire *denti"Ncation Number3Maximum tire load (  page 366)4Maximum tire pressure (  page 366)5Manufacturer6Tire characteristics (  page 367)7Tire size designation, load-bearing capacity,
speed rating and load index (  page 367)8Tire name\bThe data shown in the illustration is example
data.
Tire Quality Grading
In accordance with the US Department of Trans-
portation\bs "Uniform tire Quality Grading Stand-
ards", tire manufacturers are required to grade
their tires on the basis of the following three per-
formance factors:
1Tread wear grade2Traction grade3Temperature grade\bThe data shown in the illustration is example
data.\bThe classi"Ncation is not legally stipulated for
Canada, but it is generally stated.
Tread wear grade
The treadwear grade is a comparative rating based on the wear rate of the tire when testedunder controlled conditions on a speci"Ned govern-
ment test course. For example, a tire graded 150
would wear one and one-half (1=1/2=) times as
364Wheels and tires

well on the government course as a tire graded
100.
The relative performance of tires depends upon the actual conditions of their use, however, and
may depart signi"Ncantly from the norm due to var-
iations in driving habits, service practices and dif-
ferences in road characteristics and climate.
Traction grade&DANGER Risk of accident due to inade-
quate traction
The traction grade assigned to this tire is
based on straight-ahead braking traction
tests.
Always adapt your driving style and drive
at a speed to suit the prevailing tra"Pc
and weather conditions.*NOTE Damage to the drivetrain from
wheelspinAvoid wheelspin.The traction grades, from highest to lowest, are
AA, A, B, and C. Those grades represent the tire\bs ability to stop on wet pavement as measured
under controlled conditions on speci"Ned govern-
ment test surfaces of asphalt and concrete. A tire
marked C may have poor traction performance.
Temperature grade&WARNING Risk of accident from tire over-
heating and tire failure
Excessive speed, underin"Oation, or excessive
loading, either separately or in combination, can cause excessive heat build-up and possi-
ble tire failure.
Observe the recommended tire pressure.Regularly check the pressure of all the
tires.Adjust the tire pressure, if necessary.
The temperature grades are A (the highest), B, and C, representing the tire\bs resistance to thegeneration of heat and its ability to dissipate heat
when tested under controlled conditions on a speci"Ned indoor laboratory test wheel. Sustained
high temperature can cause the material of the
tire to degenerate and reduce tire life, and exces-sive temperature can lead to sudden tire failure.
The grade C corresponds to a level of perform-
ance which all passenger car tires must meet
under the Federal Motor Safety Standard No. 109. Grades B and A represent higher levels of
performance on the laboratory test wheel than the minimum required by law.
DOT, Tire *denti"Ncation Number (TIN)
US tire regulations stipulate that every tire manu-
facturer or retreader must imprint a TIN in or on
the side wall of each tire produced.
Wheels and tires365

\bThe data shown in the illustration is example
data.
The TIN is a unique identi"Ncation number to iden-
tify tires and comprises the following:
= DOT (Department of Transportation): tire sym-
bol marks 1 indicating that the tire complies
with the requirements of the US Department of Transportation.
= Manufacturer identi"Ncation code: manufac-
turer identi"Ncation code 2 contains details of
the tire manufacturer. New tires have a code
with two symbols. Retreaded tires have a code
with four symbols. Further information on
retreaded tires (  page 371).
= Tire size: identi"Ner 3 describes the tire size.
= Tire type code: tire type code 4 can be used
by the manufacturer as a code to describe
speci"Nc characteristics of the tire.
= Manufacturing date: manufacturing date 5
provides information about the age of a tire.
The 1st and 2nd positions represent the cal-
endar week and the 3rd and 4th positions
state the year of manufacture (e.g. "3208"
represents the 32nd week of 2008).
Information on the maximum tire load\bThe data shown in the illustration is example
data.
Maximum tire load 1 is the maximum permissi-
ble weight for which the tire is approved.
Do not overload the tires by exceeding the speci- "Ned load limit. The maximum permissible load can
be found on the vehicle\bs Tire and Loading Infor-
mation placard on the B-pillar on the driver\bs side (  page 360).
Speci"Ncations for maximum tire pressure\bThe data shown in the illustration is example
data.
Never exceed maximum tire pressure 1 speci-
"Ned for the tire. Always observe the recommen-
ded tire pressure for your vehicle when adjusting
the tire pressure (  page 355).
366Wheels and tires

Information on tire characteristics\bThe data shown in the illustration is example
data.
This information describes the type of tire cord
and the number of layers in side wall 1 and
under tire tread 2.
Tire size designation, load-bearing capacity, speed
rating and load index&WARNING Risk of injury through exceed-
ing the speci"Ned tire load-bearing capa-
city or the permissible speed rating
Exceeding the speci"Ned tire load rating or the
permissible speed rating may lead to tire dam-
age and to the tires bursting.
Therefore, only use tire types and sizes
approved for your vehicle model.Observe the tire load rating and speed
rating required for your vehicle.1First letter(s)2Nominal tire width in millimeters3Aspect ratio in %4Tire code5Rim diameter6Load-bearing index7Speed rating8Load index\bThe data shown in the illustration is example
data.
Information about reading tire data can be
obtained from any quali"Ned specialist workshop.
Wheels and tires367

First letter(s) 1:
= Without: passenger vehicle tires according to
European manufacturing standards.
= "P": passenger vehicle tires according to US
manufacturing standards.
= "LT": light truck tires according to US manu-
facturing standards.
= "T": compact emergency spare wheels with
high tire pressure that are only designed for
temporary use in an emergency.
Aspect ratio 3:
Ratio between tire height and tire width in percent (tire height divided by tire width).
Tire code 4 (tire type):
= "R" radial tire
= "D": bias ply tire
= "B": bias belted tires
= "ZR": radial tire with a maximum speed above
149 mph (240 km/h) (optional)Rim diameter 5:
The diameter of the bead seat (not the diameter
of the rim "Oange). The rim diameter is speci"Ned in
inches (in).
Load-bearing index 6:
Numerical code that speci"Nes the maximum load-
bearing capacity of a tire (e.g. "91" corresponds
to 1,356 lbs (615 kg)).
The load-bearing capacity of the tire must be at least half the gross axle weight rating of your vehi-cle. Do not overload the tires by exceeding the
speci"Ned load limit.
See also: = Maximum permissible load on the Tire and
Loading Information placard (  page 360)
= Maximum tire load (  page 366)
= Load index
Speed rating 7:
Speci"Nes the approved maximum speed of the
tire.\bAn electronic speed limiter prevents your
vehicle from exceeding a speed of 130 mph
(210 km/h).
Make sure that your tires have the required speed
rating. You can obtain information on the required
speed rating from an authorized Mercedes-Benz
Center.
Summer tires
IndexSpeed ratingQup to 100 mph (160 km/h)Rup to 106 mph (170 km/h)Sup to 112 mph (180 km/h)Tup to 118 mph (190 km/h)Hup to 130 mph (210 km/h)Vup to 149 mph (240 km/h)Wup to 168 mph (270 km/h)Yup to 186 mph (300 km/h)368Wheels and tires