Volvo XC90 2018 Owner's Manual page 541

and rear wheels should be switched with each
other. A suitable distance for the first change is
approx. 5000 km (approx. 3100 miles) and then
at 10000 km (approx. 6200 miles) intervals.
Volvo recommends the an authorised Volvo work-
shop is contacted for checking if you are uncer-
tain about tread depth. If significant differences in
wear (> 1 mm difference in tread depth) between
tyres have already occurred, then the least worn
tyres must always be fitted on the rear. Under-
steer is normally easier to correct than oversteer,
and leads to the car continuing forwards in a
straight line rather than having the rear end skid-
ding to one side, resulting in possible complete
loss of control over the car. This is why it is
important for the rear wheels never to lose grip
before the front wheels.
Storing wheels and tyres
When you store complete wheels (tyres fitted on
wheel rims) they should be hung up or positioned
lying on their sides on the floor.
Tyres not fitted on rims must be stored lying on
their sides or standing upright, but not hung up.
IMPORTANT
Tyres should be stored in a cool, dry and dark
place, and should never be stored close to
solvents, petrol, oils, etc.
WARNING
Wheel rim size and tyre size for your
•
Volvo are specified to meet stringent
requirements for stability and driving cha-
racteristics. Unapproved combinations of
wheel rim size and tyre size may have a
negative effect on the car's stability and
driving characteristics.
Any damage caused by the fitting of
•
unapproved combinations of wheel rim
size and tyre size is not covered by the
new car warranty. Volvo accepts no liabil-
ity for death, personal injury or any costs
caused by such installations.
Related information
Checking tyre pressure (p. 542)
•
Tyres' rotation direction (p. 541)
•
Tread wear indicators on the tyres (p. 541)
•
• Tyre pressure monitoring system* (p. 544)
Emergency puncture repair kit (p. 557)
•
Dimension designation for tyre (p. 539)
•
Approved wheel and tyre sizes (p. 656)
•
Recommendations for loading (p. 571)
•
WHEELS AND TYRES
Dimension designation for tyre
Designations for tyre dimension, load index and
speed rating.
The car has an approval for the complete vehicle
with certain combinations of wheel rims and
tyres.
Designation of dimensions
All tyres have a dimension designation, such as
235/60 R18 103 H.
235 Tyre width (mm)
60 Ratio between tyre wall height and tyre
width (%)
R Radial ply
18 Rim diameter in inches
103 Codes for the maximum permitted tyre
load, tyre load index (LI)
H Speed rating for maximum permitted
speed, speed rating (SS). (In this case
210 km/h (130 mph).)
Load index
Each tyre has a certain capacity to carry a load, a
load index (LI). The car's weight determines the
load capacity required of the tyres.
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539
* Option/accessory.