Manual BMW 1 serie - 2013 (page 234 of 288) (English)

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Wheels and tires

Mobility

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.<

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

separately 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 230.

M+S

Winter and all-season tires.

These have better winter properties than

summer 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

Driving over rough or damaged road surfaces,

as well as debris, curbs and other obstacles can

cause serious damage to wheels, tires, and sus-

pension parts. This is more likely to occur with

low-profile tires, which provide less cushioning

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.

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BMW 1 serie - 2013 Manual

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