BMW iX Owner's Manual page 318

MOBILITY
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
Tire Identification Number
DOT Code: DOT xxxx xxx 3822
xxxx: manufacturer code for the tire brand
xxx: tire size and tire design
3822: 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 ... 3822 38th week of 2022
318
Wheels and tires
Online Edition for Part no. 01405A6B2E9 - X/22
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; Tempera-
ture A
DOT Quality Grades
Treadwear
Traction AA A B C
Temperature A B C
All passenger vehicle 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 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.
Traction
The traction grades, from highest to lowest,
are AA, A, B, and C.
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.
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.