Self-Supporting Run Flat Tires (Sst) - Volvo S 80 Owner's Manual

09 Wheels and tires
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09
NOTE
•
Tire monitoring systems use a tem-
perature compensated pressure value.
This pressure value is dependent on
tire temperature and ambient tempera-
ture, which can differ from the recom-
mended cold tire pressure in the tire
inflation table and on the tire pressure
placard located on the driver's side B-
pillar (the structural member at the
side of the vehicle, at the rear of the
driver's door opening). This means
that it may sometimes be necessary to
inflate them slightly above the recom-
mended cold pressure value
(approx. 3-4 psi or 0.2-0.3 bar) in order
to reset a low tire pressure warning.
•
To help avoid incorrect tire inflation
pressure, if possible only inflate the
tires when they are cold. The tires are
considered to be cold when they have
the same temperature as the sur-
rounding (ambient) air. This tempera-
ture is normally reached after the vehi-
cle has been parked for at least
3 hours. After driving a distance of
approximately 1 mile (1.6 km), the tires
are considered to be hot.
294
CAUTION
•
After inflating the tires, always reinstall
the valve cap to help avoid damage to
the valve from dirt, gravel, etc.
•
Use plastic valve caps only. Metal
caps could corrode and become diffi-
cult to remove.
WARNING
•
Incorrect inflation pressure could lead
to tire failure, resulting in a loss of con-
trol of the vehicle.
•
Tire monitoring systems cannot indi-
cate sudden tire damage caused by
external factors (e.g., a blowout) in
advance.
Related information
•
Tire Monitor – messages (p. 293)
•
Tire inflation – checking pressure (p. 278)
•
Tire inflation – pressure table (p. 282)

Self-supporting run flat tires (SST)

Self-supporting run flat tires are available as
optional equipment on certain models.
The vehicle must be equipped with one of the
tire pressure monitoring systems if tires of
this type are installed.
Tires of this type have specially reinforced
sidewalls that make it possible to continue
driving to a limited extent even though the tire
has lost some or all of its inflation pressure.
These tires are mounted on special rims (nor-
mal tires can also be mounted on these rims).
If an SST tire loses inflation pressure, the yel-
low TPMS symbol illuminates in the instru-
ment panel and a text message is also dis-
played. If this happens, reduce speed to not
more than 50 mph (80 km/h). The tire should
be replaced as soon as possible.