BMW Z3 roadster 3.0i Manuale del Proprietario Scaricare il pdf (Pagina 110)

110n

Tire replacement

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

temperature can lead to sudden tire

failure. The grade C corresponds to a

level of performance which all

passenger vehicle tires must meet

under the Federal Motor Vehicle 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, under-inflation, or

excessive loading, either separately or

in combination, can cause heat buildup

and possible tire failure.<

Uniform Tire Quality Grading

Quality grades can be found where

applicable on the tire sidewall between

tread shoulder and maximum section

width. For example:

Tread wear 200 Traction AA

Temperature A

Do not use retreaded tires as this

could negatively affect driving

safety. This is due to the possible varia-

tions in casing structures and, in some

cases, to their extreme age, factors

which can lead to a decrease in their

durability.<

Tire age

The date on which the tire was manu-

factured is indicated by the code on the

sidewall:

DOT ... 2500 indicates that the tire was

manufactured in week 25 of 2000.

BMW recommends the replacement

of all tires when the tires are no more

than 6 years old, even if a tire usage of

10 years is possible.

Spare tires over 6 years old should be

used only in case of emergency. A tire

of this age should be replaced by a new

tire immediately, and should not be

fitted together with new tires.

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