Volvo XC 90 Owner's Manual page 408

WHEELS AND TIRES
Tires
Your vehicle is equipped with tires according to
the vehicle's tire information placard on the B-
pillar (the structural member at the side of the
vehicle, at the rear of the driver's door opening).
CAUTION
Some Volvo models are equipped with an
Ultra High Performance tire and wheel com-
bination designed to provide maximum dry
pavement performance with consideration for
hydroplaning resistance. They may be more
susceptible to road hazard damage and,
depending on driving conditions, may achieve
a tread life of less than 20,000 miles (30,000
km). Even if this vehicle is equipped with
Volvo's advanced AWD or stability system,
these tires are not designed for winter driving,
and should be replaced with winter tires when
weather conditions dictate.
The tires have good road holding characteristics
and offer good handling on dry and wet surfaces.
It should be noted however that the tires have
been developed to give these features on snow/
ice-free surfaces.
Most models are equipped with "all-season" tires,
which provide a somewhat higher degree of road
holding on slippery surfaces than tires without
the "all-season" rating. However, for optimum
Not available in all models.
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406
road holding on icy or snow-covered roads, we
recommend suitable winter tires on all four
wheels.
When replacing tires, be sure that the new tires
are the same size designation, type (radial) and
preferably from the same manufacturer, on all
four wheels. Otherwise there is a risk of altering
the car's roadholding and handling characteris-
tics.
New tires
Remember that tires are perishable goods. As of
2000, the manufacturing week and year (Depart-
ment of Transportation (DOT) stamp) will be indi-
cated with 4 digits (e.g., 0715 means that the tire
illustrated was manufactured during week 7 of
2015).
Tire age
Tires degrade over time, even when they are not
being used. It is recommended that tires gener-
ally be replaced after 6 years of normal service.
Heat caused by hot climates, frequent high load-
ing conditions or Ultra Violet (U.V.) exposure can
accelerate the aging process. The temporary
1
spare should also be replaced at 6-year inter-
vals, even if it has never been used. A tire's age
can be determined by the DOT stamp on the
sidewall (see the illustration). A tire with e.g., visi-
ble cracks or discoloration should be replaced
immediately.
Tire economy
•
Maintain correct tire pressure.
•
Avoid fast starts, hard braking and tire
screeching.
•
Tire wear increases with speed.
•
Correct front wheel alignment is very impor-
tant.
•
Unbalanced wheels impair tire economy and
driving comfort.
•
Tires must maintain the same direction of
rotation throughout their lifetime.
•
When replacing tires, the tires with the most
tread should be mounted on the rear wheels