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Wheels
●
If the tyre pr
essure is too low or too high,
the tyres will wear prematurely and the ve-
hicle will not handle well. Risk of accident!
For the sake of the environment
Under-inflated tyres will increase fuel con-
sumption.
Service life of tyres
Fig. 272 Tyre tread wear indicators.
Fig. 273 Diagram for changing wheels.
The useful life of tyres is dependent on tyre
pr
essur
e
, driving style and fitting.
Wear indicators
The original tyres on your vehicle have
1.6 mm high “tread wear indicators”
›››
Fig. 272, running across the tread. De-
pending on the make, there will be 6 to 8 of
them evenly spaced around the tyre. Mark-
ings on the tyre sidewall (for instance the let-
ters “TWI” or other symbols) indicate the po-
sitions of the tread wear indicators. The mini-
mum tread depth required by law is 1.6 mm
(measured in the tread grooves next to the
tread wear indicators). Worn tyres must be
replaced. Different figures may apply in ex-
port countries
›››
.
T
yr
e pr
essure
Incorrect tyre pressure causes premature
wear and could cause tyre blow-out. For this
reason, the tyre pressure should be checked
at least once per month
›››
page 312.
Driving style
Fast cornering, heavy acceleration and hard
braking all increase tyre wear.
Changing wheels around
If the front tyres are worn considerably more
than the rear ones it is advisable to change
them around as shown
›››
Fig. 273. The useful
life of all the tyres will then be about the
same time.
Wheel balance
The wheels on new vehicles are balanced.
However, various factors encountered in nor-
mal driving can cause them to become un-
balanced, which results in steering vibration.
Unbalanced wheels should be rebalanced,
as they otherwise cause excessive wear on
steering, suspension and tyres. A wheel must
also be rebalanced when a new tyre is fitted.
Incorrect wheel alignment
Incorrect running gear alignment causes ex-
cessive tyre wear, impairing the safety of the
vehicle. If tyres show excessive wear, you
should have the wheel alignment checked by
a Technical Service.
»
313
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