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EnglishWheels and tires -> Tire identification marks for your BMW i8 2014-2020
Wheels and tires
MOBILITY
Locate the maximum tire load on the tire sidewall
and the Gross Axle Weight Rating – GAWR – on
the certification label on the driver’s door pillar.
Tire inflation pressure values over
100 mph/160 km/h
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.
i8 Coupe
Tire size
Pressure specifications in
bar/PSI
Specifications in
bar/PSI with
cold tires
Speed letter
Designation
Maximum speed
Q
R:
S
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
up to 131 mph/210 km/h
up to 150 mph/240 km/h
up to 167 mph/270 km/h
up to 186 mph/300 km/h
215/45 R 20 95 2.3 / 33
V XL M+S
2.8 / 41
Front: 215/45 R 2.3 / 33
20 95 W XL
-
T
Rear: 245/40 R
20 99 W XL
-
2.8 / 41
-
H
V
Front: 195/50 R 2.5 / 36
20 93 W XL
W
Y
Rear: 215/45 R
20 95 W XL
-
3.0 / 44
Tire Identification Number
DOT code: DOT xxxx xxx 3819
xxxx: manufacturer code for the tire brand
xxx: tire size and tire design
3819: tire age
Tire identification marks
Tire size
245/45 R 18 96 Y
Tires with DOT codes meet the guidelines of the
U.S. Department of Transportation.
245: nominal width in mm
45: aspect ratio in %
R: radial tire code
Tire age
18: rim diameter in inches
96: load rating, not for ZR tires
Y: speed rating, before the R on ZR tires
Recommendation
Regardless of the tire tread, replace tires at least
every 6 years.
Maximum tire load
Maximum tire load is the maximum permissible
weight for which the tire is approved.
Manufacture date
You can find the manufacture date of the tire on
the tire's sidewall.
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Wheels and tires
MOBILITY
does not include acceleration, cornering, hydro‐
planing, or peak traction characteristics.
Designation
Manufacture date
38th week, 2019
DOT … 3819
Temperature
Uniform Tire Quality Grading
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 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 un‐
der 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.
Quality grades can be found where applicable on
the tire sidewall between tread shoulder and
maximum section width.
E.g.: Treadwear 200; Traction AA; Temperature
A
DOT Quality Grades
Treadwear
Traction AA A B C
Temperature A B C
All passenger vehicle tires must conform to Fed‐
eral Safety Requirements in addition to these
grades.
Warning
The temperature grade for this tire is estab‐
lished for a tire that is properly inflated and not
overloaded. Excessive speed, underinflation, or
excessive loading, either separately or in com‐
bination, can cause heat buildup and possible
tire failure.
Treadwear
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, however, and
may depart significantly from the norm due to
variations in driving habits, service practices and
differences in road characteristics and climate.
M+S
Winter and all-season tires with better cold
weather performance than summer tires.
Tire tread
Traction
The traction grades, from highest to lowest, are
AA, A, B, and C.
Summer tires
Do not drive with a tire tread of less than
0.12 in/3 mm, otherwise there is an increased
risk of hydroplaning.
Those grades represent the tire's ability to stop
on wet pavement as measured under controlled
conditions on specified government test surfa‐
ces of asphalt and concrete. A tire marked C may
have poor traction performance.
Winter tires
The traction grade assigned to this tire is based
on straight-ahead braking traction tests, and
Do not drive with a tire tread of less than
0.16 in/4 mm, as such tires are less suitable for
winter operation.
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