BMW iX Owner's Manual page 319

Temperature
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
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.
Warning
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.
M+S
Winter and all-season tires with better cold
weather performance than summer tires.
Tire tread
Summer tires
Do not drive with a tire tread depth of less than
0.12 in/3 mm, otherwise there is an increased
risk of aquaplaning.
Winter tires
Do not drive with a tire tread depth of less than
0.16 in/4 mm, as such tires are less suitable for
winter driving conditions.
Online Edition for Part no. 01405A6B2E9 - X/22
Wheels and tires
All-season tires
Do not drive with a tire tread depth of less than
0.16 in/4 mm, as such tires are less suitable for
winter driving conditions.
Minimum tread depth
Distributed over the tire circumference are
the tire manufacturer's wear indicators with a
height of at least 0.06 in/1.6 mm, which serve
as an indicator of tire tread wear.
The positions of the wear indicators are
marked on the tire sidewall with TWI, Tread
Wear Indicator.
Irrespective of the wear indicators, observe the
statutory regulations on the minimum tread
depth.
Tire damage
General information
Check your tires regularly for damage, foreign
bodies lodged in the tread, and tread wear.
Driving over rough or damaged road surfaces,
as well as debris, curbs and other obstacles
can cause serious damage to wheels, tires and
suspension parts. This is more likely to occur
with low-profile tires, which provide less cush-
ioning between the wheel and the road. Be
careful to avoid road hazards and reduce your
speed, especially if your vehicle is equipped
with low-profile tires.
Indications of tire damage or other vehicle mal-
functions:
MOBILITY
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