Seat Mii 2019 Owner's Manual page 213

approximately the same on the front and rear
tyres. This is particularly important when driv-
ing in winter, in cold temperatures and on wet
›››
roads .
The minimum tread depth required by law in
the majority of cases is 1.6 mm, measured in
the tread grooves next to the tread wear indi-
cators. Observe legal requirements in each
country.
The performance of winter tyres is much re-
duced when the tread has worn to 4 mm.
The tread depth of new tyres may vary, ac-
cording to the type and make of tyre and the
tread pattern.
Wear indicators on the tyre
The original tyres on your vehicle have
›››
1.6 mm high Fig. 188 tread wear indicators
running across the tread. A number of these
indicators are equally spaced around the
tyre tread. Certain marks on the tyre walls
(e.g. the letters "TWI" or other symbols) indi-
cate the position of the wear indicators.
Tread wear indicators indicate if a tyre is
worn. They must always be replaced before
the tyre tread has worn to the level of the in-
dicator.
Wheels and tyres
WARNING
Driving with worn tyres is dangerous, and
may lead to loss of control of the vehicle
with serious consequences.
Tyres must be replaced before the wear
●
indicators are at the same level as the
tread pattern.
Worn tyres have significantly reduced
●
grip, especially on wet surfaces, increasing
the risk of "aquaplaning".
Worn tyres make control of the vehicle
●
more difficult in normal or difficult driving
conditions, increasing the braking distance
and the risk of skidding.
Tyre damage
Damage to wheels and tyres is often invisible
to the naked eye. If you notice unusual vibra-
tion or the car pulling to one side, this may
indicate that one of the tyres is damaged
›››
.
Slow down immediately if you think you
●
have a damaged wheel.
Check the wheels and tyres for damage.
●
If tyres are worn, stop driving and seek
●
qualified assistance.
If there is no visible exterior damage, drive
●
slowly and carefully to the nearest special-
ised workshop and have the vehicle checked.
Foreign bodies in the tyre
Do not remove foreign bodies if they have
●
penetrated through the tyre wall!
You should obtain professional assistance
●
immediately.
Tyre wear
The wear of tyres depends on a number of
factors, for example:
Driving style.
●
Unbalanced wheels.
●
Running gear settings.
●
Driving style: driving round bends quickly or
sudden acceleration or braking speed accel-
erates tyre wear. When the driving style is
normal, if the tyres wear too quickly, have the
running gear settings checked at a special-
ised workshop.
Eccentricity of the wheels: the wheels of a
new vehicle are balanced. However, certain
circumstances may lead to imbalance (run-
out), which is detected as vibrations in the
steering wheel. Run-out leads to wear of the
steering and suspension. In the event of run
out, the wheels should be balanced again.
When a new wheel is fitted, it should be bal-
anced again.
Adjustments of the running gear: misaligned
running gear increases the wear of the tyres
and affects safety while driving. If tyres wear
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