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EnglishWheels and tires -> Tire marking for your BMW i4 2021-2025
Wheels and tires
MOBILITY
Tire size
Pressure specifica-
tions in bar/PSI
Designation Maximum speed
H
V
up to 131 mph/210 km/h
Front 245/40 R 19
98 W XL M+S
2.9 / 42
-
up to 150 mph/240 km/h
up to 167 mph/270 km/h
up to 186 mph/300 km/h
above 186 mph/300 km/h
W
Y
Rear: 255/40 R 19
100 W XL M+S
-
3.3 / 48
(Y)
Tire marking
Tire Identification Number
DOT code: DOT xxxx xxx 1924
xxxx: manufacturer code for the tire brand
xxx: tire size and tire design
1924: tire age
Tire size
245/45 R 18 96 Y
245: nominal width in mm
45: cross-sectional relationship in %
R: radial tire code
Tires with DOT codes meet the guidelines of
the U.S. Department of Transportation.
18: rim diameter in inches
96: load index
Tire age
Y: speed code letter
Recommendation
Regardless of the tire tread depth, replace tires
at least every 6 years.
ZR tires: reinforced radial tire for speeds ex-
ceeding 150 mph/240 km/h
Maximum tire load
Maximum tire load is the maximum permissi-
ble weight for which the tire is approved.
Production date
You can find the tire production date on the tire
sidewall.
Locate the maximum tire load on the tire
sidewall and the Gross Axle Weight Rating –
GAWR – on the certification label on the driver
door B-pillar. Divide the tire load by 1.1. It must
be greater than one-half of the vehicle’s Gross
Axle Weight Rating – GAWR. Note, front vs.
rear GAWR and tire loads, respectively.
Designation
Production date
DOT … 1924
19th week of 2024
Uniform Tire Quality Grading
Quality grades can be found where applicable
on the tire sidewall between tread shoulder
and maximum section width.
Speed letter
E.g.: Treadwear 200; Traction AA; Tempera-
ture A
Designation Maximum speed
Q
R
S
T
up to 100 mph/160 km/h
up to 106 mph/170 km/h
up to 112 mph/180 km/h
up to 118 mph/190 km/h
DOT Quality Grades
Treadwear
Traction AA A B C
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Wheels and tires
MOBILITY
Temperature A B C
car tires must meet under the Federal Motor
Vehicle Safety Standard No. 109. Grades Band
A represent higher levels of performance on
the laboratory test wheel than the minimum
required by law.
All passenger vehicle tires must conform to
Federal Safety Requirements in addition to
these grades.
Treadwear
Warning
The treadwear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a specified gov-
ernment test course. E.g., a tire graded 150
would wear one and one-half, 1 g, times as
well on the government course as a tire graded
100. The relative performance of tires depends
upon the actual conditions of their use, how-
ever, and may depart significantly from the
norm due to variations in driving habits, service
practices and differences in road characteris-
tics and climate.
The temperature grade for this tire is estab-
lished for a tire that is properly inflated and
not overloaded. Excessive speed, underinfla-
tion, or excessive loading, either separately
or in combination, can cause heat buildup
and possible tire failure. There is a risk of
accident, injury, and property damage.
Runflat tires
Runflat tires, refer to page 311, are labeled
with a circular icon containing the letters RSC
marked on the tire sidewall.
Traction
The traction grades, from highest to lowest,
are AA, A, B, and C.
M+S
Those grades represent the tire's ability to
stop on wet pavement as measured under
controlled conditions on specified government
test surfaces of asphalt and concrete. A tire
marked C may have poor traction perform-
ance.
Winter tires, as well as all-season tires with
better winter performance than summer tires,
can be identified by the M+S marking on the
tire side wall.
Tire tread
Safety information
Warning
The traction grade assigned to this tire is
based on straight-ahead braking traction tests,
and does not include acceleration, cornering,
hydroplaning, or peak traction characteristics.
Temperature
If the tire tread depth is too low, driving
safety may be impaired in critical situations
such as aquaplaning or slush on the road.
There is a risk of accident, injury, and prop-
erty damage. The tire tread depth may not
fall below 0.12 in/3 mm for summer tires and
0.16 in/4 mm for winter and all-season tires,
or observe the statutory regulations on mini-
mum tread depth.
The temperature grades are A, the highest, B,
and C, representing the tire's resistance to the
generation of heat and its ability to dissipate
heat when tested under controlled conditions
on a specified indoor laboratory test wheel.
Sustained high temperature can cause the
material of the tire to degenerate and reduce
tire life, and excessive temperature can lead to
sudden tire failure. The grade C corresponds
to a level of performance which all passenger
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