Polestar 2 2020, Руководство пользователя

Страница: 456 / 568

Tread wear indicators
on the tyres
Tread wear indicators show the status of the
tyre's tread depth.
A tread wear indicator is a narrow elevation
across the longitudinal grooves of the tyre's
tread pattern. On the side of the tyre are the let-
ters TWI (Tread Wear Indicator). When the tyre's
tread depth is down to 1.6 mm (1/16 inch), the
tread will be level in height with the tread wear
indicators. Change to new tyres as soon as pos-
sible. Remember that tyres with little tread
depth provide very poor grip in rain and snow.
Related information
• Tyres (p. 452)
Checking tyre pressure
Correct tyre pressure helps to improve driving
stability, save energy consumption and extend
the service life of the tyres.
Tyre pressure decreases over time, this is a nat-
ural phenomenon. Tyre pressure also varies
depending on ambient temperature. Driving on
tyres with tyre pressure that is too low could
result in the tyres overheating and being dam-
aged. Tyre pressure affects travelling comfort,
road noise and driving characteristics.
Check the tyre pressures monthly. Use the rec-
ommended tyre pressure for cold tyres in order
to maintain good tyre performance. Tyre pres-
sure that is too low or too high may cause
uneven wear on the tyres.
Cold tyres
The tyre pressure must be checked when the
tyres are cold. Tyres are considered cold when
they have the same temperature as the sur-
rounding air. This temperature is normally
reached when the car has been parked for at
least three hours.
After having driven approximately 1.6 km (1 mile)
these tyres are considered as warm. If you have
to drive further than this to inflate the tyres, first
check and record the tyre pressure and inflate
to a suitable tyre pressure when you arrive at
the pump.
When the outside temperature changes, the
tyre pressure also changes. A decrease in tem-
perature of 10 degrees causes the tyre pressure
to decrease 1 psi (7 kPa). Check the tyre pres-
sure regularly and adjust to the correct pres-
sure, which is specified on the car's tyre infor-
mation decal or certification label.
If you check the tyre pressure when the tyres
are warm then you must never release any air.
The tyres are warm due to driving and it is nor-
456 Wheels and tyres