Manual BMW 328i xDrive - 2010 (page 143 of 200) (English)

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141

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 Vehi-

cle Safety Standard No. 109. Grades B and A

represent higher levels of performance on the

laboratory test wheel than the minimum

required by law.

The temperature grade for this tire is

established for a tire that is properly

inflated and not overloaded. Excessive speed,

underinflation, or excessive loading, either sep-

arately or in combination, can cause heat

buildup and possible tire failure.<

RSC – run-flat tires

You will recognize run-flat tires by a circular

symbol containing the letters RSC on the side

of the tire, refer to page 142.

M+S

Winter and all-season tires.

These have better winter properties than sum-

mer tires.

Designation for specially reinforced tires.

Tire condition

Inspect your tires frequently for tread wear,

signs of damage and for foreign objects lodged

in the tread. Check the tread depth.

Minimum tread depth

The tread depth should not drop below 0.12 in/

3 mm, although, for example, European legisla-

tion only specifies a minimum tread depth of

0.063 in/1.6 mm. At tread depths below

0.12 in/3 mm there is an increased risk of high-

speed hydroplaning, even when only small

amounts of water are present on the road

surface.

When winter tires wear down past a tread depth

of 0.16 in/4 mm, they become perceptibly less

suitable for winter conditions. In the interest of

safety, new tires should be installed.

Wear indicators in the base of the tread groove

are distributed around the tire's circumference;

the letters TWI, for Tread Wear Indicator, on the

tire's sidewalls identify tires that incorporate

these wear indicators. Once the tire tread has

worn down to the wear indicators, the tire has

worn to a depth of 0.063 in/1.6 mm.

Wheel/tire damage

Please note that low-profile tires cause wheels,

tires and suspension parts to be more suscep-

tible to road hazard and consequential dam-

ages.

Unusual vibrations encountered during normal

vehicle operation can indicate tire failure or

some other vehicle defect. This can, for exam-

ple, be caused by driving over curbs. The same

applies to any other abnormal road behavior,

such as pulling severely to the right or left.

In these cases, reduce speed immedi-

ately and have wheels and tires thor-

oughly checked. To do so, drive carefully to the

nearest BMW center or tire shop that works

according to BMW repair procedures with cor-

respondingly trained personnel. If necessary,

have the vehicle towed there.

Otherwise, tire damage can pose a lethal hazard

to vehicle occupants and other road users.<

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BMW 328i xDrive - 2010 Manual

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