Sharp R-330CW Owner's Manual download pdf (Page 112)

112

ceed carefully to the nearest BMW cen-

ter or professional tire center, or have

the vehicle towed in to have it, its

wheels or its tires inspected.

Tire damage up to and including sud-

den and complete air loss can endan-

ger the lives of both the vehicle occu-

pants and other road users.<

Tire replacement

To maintain good handling and vehicle

response, use only tires of a single

tread configuration from a single manu-

facturer.

DOT quality grades

Tread wear

Traction AA A B C

Temperature A B C

All passenger car tires must con-

form to Federal Safety Require-

ments in addition to these grades.<

Tread wear

The tread wear grade is a comparative

rating based on the wear rate of the tire

when tested under controlled condi-

tions on a specified government test

course.

For example, a tire graded 150 would

wear one and one-half – 1

1

/

2

– times as

well on the government course as a tire

graded 100. The relative performance

of tires depends upon the actual condi-

tions of their use, however, and may

depart significantly from the norm due

to variations in driving habits, service

practices and differences in road char-

acteristics 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 speci-

fied government test surfaces of

asphalt and concrete. A tire marked C

may have poor traction performance.

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 charac-

teristics.<

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 condi-

tions 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 tem-

perature can lead to sudden tire failure.

The grade C corresponds to a level of

performance which all passenger car

Tire condition

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