Tyres - Tread Wear Indicators; Tyres - Air Pressure - Volvo V40 Owner's Manual

WHEELS AND TYRES

Tyres - tread wear indicators

Tread wear indicators show the status of the
tyre's tread depth.
Tread wear indicators.
A tread wear indicators is a narrow elevation
across the longitudinal grooves of the tyre's tread
pattern. On the side of the tyre are the letters
TWI (Tread Wear Indicator). When the tyre's tread
depth is down to 1.6 mm, the tread will be level in
height with the tread wear indicators. Change to
new tyres as soon as possible. Remember that
tyres with little tread depth provide very poor grip
in rain and snow.
Related information
•
Tyres - speed ratings (p. 318)
•
Tyres - air pressure (p. 316)
•
Tyres - direction of rotation (p. 315)
316

Tyres - air pressure

Tyres can have different air pressures which are
measured in bar.
Check the air pressure in the tyres
The air pressure for the tyres should be checked
every month and should be checked on cold
tyres. "Cold tyres" means the tyres are the same
temperature as the ambient temperature. After
several few kilometres of driving, the tyres warm
up and the pressure increases.
Inadequate tyre pressure increases fuel con-
sumption, shortens tyre lifespan and impairs the
car's driving characteristics. Driving on tyres with
tyre pressure that is too low could result in the
tyres overheating and being damaged. Tyre pres-
sure affects travelling comfort, road noise and
driving characteristics.
NOTE
Tyre pressure decreases over time, this is a
natural phenomenon. Tyre pressure also var-
ies depending on ambient temperature.
Tyre pressure label
The tyre pressure label on the driver's side door
pillar (between frame and rear door) shows which
pressure the tyres should have at different loads
and speed conditions. This is also specified in the
tyre pressure table.
Tyre pressure for the car's recommended tyre
dimension and information about ECO pressure
that results in improved fuel economy can be
found in the printed owner's manual.
NOTE
Temperature differences change the
tyre pressure.
Fuel economy, ECO pressure
When carrying a light load (max. 3 people) and at
speeds of up to 160 km/h (100 mph), the ECO