BMW M4 COUPE Owner's Manual page 322
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Also See for M4 COUPE:
- Technical training manual (116 pages) ,
- Owner's manual (240 pages) ,
- Owner's handbook manual (265 pages)
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MOBILITY
Tire marking
Tire size
245/45 R 18 96 Y
245: nominal width in mm
45: aspect ratio in %
R: radial tire code
18: rim diameter in inches
96: load bearing capacity
Y: speed code letter
ZR tires: reinforced radial tire for speeds exceed‐
ing 150 mph/240 km/h
Maximum tire load
Maximum tire load is the maximum permissible
weight for which the tire is approved.
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.
Speed letter
Designation
Maximum speed
Q
up to 100 mph/160 km/h
R
up to 106 mph/170 km/h
S
up to 112 mph/180 km/h
T
up to 118 mph/190 km/h
H
up to 131 mph/210 km/h
V
up to 150 mph/240 km/h
W
up to 167 mph/270 km/h
Y
up to 186 mph/300 km/h
(Y)
above 186 mph/300 km/h
322
Wheels and tires
Online Edition for Part no. 01405A38097 - VI/21
Tire Identification Number
DOT Code: DOT xxxx xxx 1921
xxxx: manufacturer code for the tire brand
xxx: tire size and tire design
1921: tire age
Tires with DOT codes meet the guidelines of the
U.S. Department of Transportation.
Tire age
Recommendation
Regardless of the tire tread depth, replace tires
at least every 6 years.
Manufacture date
You can find the manufacture date of the tire on
the tire sidewall.
Designation
Manufacture date
DOT ... 1921
19th week 2021
Uniform Tire Quality Grading
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.
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
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