Wheels and Tyres
236
setting off on a long trip. Please do not forget the spare wheel when checking the tyres. The tyre inflation pressures for
summer tyres
are indicated on the inside of the fuel
filler flap
⇒page 235, fig. 210
. The inflation pressures for
winter tyres
are 20 kPa
(0.2 bar) higher than those for summer tyres
⇒page 239.
The tyre pressure should be at the highest pressure specified for your vehicle at all times. The tyre inflation pressure of the emergency spare wheel R 18 is 420 kPa (4.2 bar).Always check the inflation pressure of ty
res when cold. Do not reduce the higher
pressure of warm tyres. Adapt the inflation pressure of the tyres accordingly if your vehicle is carrying a significantly higher payload. Driving style Fast cornering, sharp acceleration and braking (squealing tyres) increase wear-and- tear on your tyres. Balancing wheels The wheels of a new vehicle are balanced. There are a wide range of influences when driving which may result in an imbalance and which makes themselves felt through vibration in the steering. You should have the wheels rebalanced
since any imbalance increases wear-and-
tear on the steering, the suspension and
tyres. A wheel must also be rebalanced
when a new tyre is fitted and each time a tyre is repaired. Wheel alignment errors Incorrect wheel alignment at the front and re
ar will not only increase wear-and-tear
on the tyres but will also has an adverse
effect on vehicle safety. Contact your
specialist garage if you notice any unusual tyre wear.
WARNING
•
If the inflation pressure is too low,
the tyre must perform a greater flexing
work. At higher speeds the tyre will warm up as a result of this. This can result in tread separation and even a tyre blowout.•
Immediately replace the damaged rims or tyres.
For the sake of the environment
Tyres which are insufficiently inflated increase your fuel consumption.Wear indicatorsThe base of the tread of the original tyres has wear indicators 1.6 mm high, installed at right angles to the direction of travel. These wear indicators are located at 6 - 8 points depending on the make and are evenly spaced around the circumference of the tyre
⇒fig. 211
. Markings on the walls of the
tyres through the letters “TWI”,
triangular symbols or other symbols identi
fy the position of the wear indicators.
A remaining tread of just 1.6 mm, measured in the grooves of the tread next to the wear indicators, means that your tyres
have reached their legally permissible
minimum tread depth.
WARNING
•
You must have your tyres replaced with new ones at the latest when the
wear indicators have been worn do
wn. The legally permissible minimum
tread depth should be observed.•
Worn tyres do not provide the necessar
y adhesion to the road surface at
high speeds on wet roads. One coul
d experience “aquaplaning” (uncon-
trolled movements of the vehicle - “swimming” on a wet road surface).
Fig. 211 Tyre tread with wear indicators
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