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302 Wheels and tyres
Tread depth and wear indicators
Fig. 179 Tyre tread:
tread wear indicators
Tread depth
Certain driving conditions require a deeper tread, as well as needing the
tread to be approximately the same on the front and rear tyres. This is par-
ticularly important when driving 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
(1/16 of an inch), 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 reduced when the tread has worn
to 4 mm (5/32 inch).
The tread depth of new tyres may vary, according 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 (1/16 inch) high ⇒ Fig. 179
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
(for example, the letters “TWI” or other symbols) indicate the position of the
wear indicators.
Tread wear indicators indicate if a tyre is worn. Tyres must always be re-
placed before the tyre tread has worn to the level of the indicator.
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 lev-
el as the tread pattern.
● Worn tyres have significantly reduced grip, especially on wet surfa-
ces, increasing the risk of “aquaplaning”.
● Worn tyres make control of the vehicle more difficult in normal or dif-
ficult driving conditions, increasing the braking distance and the risk of
skidding.
Damaged tyres
Damage to wheels and tyres is often not immediately visible. If you notice
unusual vibration 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 specialised workshop and have the vehicle checked.
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