8. Tire Replacement
The tires fitted to your vehicle as original equipment were tested and
approved by the vehicle manufacturer and the tire manufacturer and take
into account all aspects of the vehicle’s operation. Changes in the tire size,
type or construction should not be made without seeking advice from the
vehicle or tire manufacturer or an authorized Pirelli dealer since unap-
proved tires on your vehicle could adversely affect steering, handling,
braking and traction. The tire information (tire size, load index and speed
symbol) as found on the vehicle placard or in the owner ’s manual should
always be followed when replacing tires.
It is strongly recommended that Pirelli tires be mounted in sets of four
with the same tread type. Pirelli tires should not be mixed with other tire
brands. It is necessary to follow this procedure because different tire
constructions have different handling characteristics. Tires on the same
axle must be the same manufacturer, brand, tire size, load index, speed
rating and Pirelli part number.
When changing only two tires on a vehicle which is homogeneously
fitted (four tires of the same tire size), fit the new tires on the rear axle.
This applies to all vehicles regardless of their drive axle. (Front or Rear
Drive).
On all wheel drive or four wheel drive vehicles the tires must always be
replaced in sets of four.
When replacing tires on light truck vehicles, you should always follow
the vehicle manufacturer ’s recommendations. Passenger and light truck
tires are not interchangeable, due to differences in their pressures and
load carrying capacity.
P-Metric and Euro-metric Interchangeability: Euro-metric (Example: 225/
45R17) tires have a load index which is equal to or greater than that of the
same size P-metric (Example: P225/45R17) tire. Therefore, they have the
same or higher load carrying capacity at the maximum rated inflation
pressure. Always check with your tire dealer or Pirelli Tire Consumer
Affairs to be sure of the exact interchangeability to maintain proper
vehicle dynamics.
Please be aware that it is important that, before fitting the suggested tires,
the fitment is allowed by the technical specifications of the vehicle, the
vehicle manufacturer and the relevant homologations. Pirelli Tire does
not express any view as to the compatibility of the wheel/tire combina-
tion with the technical specifications for the chassis and vehicle.
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TO MAINTAIN PROPER VEHICLE DYNAMICS AND LOAD CARRY-
ING CAPACITY, REPLACEMENT TIRES MUST ALWAYS HAVE A
LOAD INDEX AND SPEED SYMBOL EQUAL TO OR GREATER THAN
THOSE FITTED AS ORIGINAL EQUIPMENT.
When making plus size fitments, you should consult with the dealer
regarding any suspension or braking system modifications which may be
recommended for the vehicle.
9. Tire Inspection
As a minimum, tires (including the spare tire) should be examined and air
pressure checked monthly and always prior to long trips. They should also
be examined if you strike any unusual object on the road. Tires showing
bulges, cracks, cuts, penetrations or uneven wear must be dismounted and
examined by an authorized Pirelli tire dealer and replaced if necessary.
Pirelli tires have treadwear indicators in the tread grooves, which show up
when the tread has worn to 2/32” remaining. At this point, your tires must
be replaced because they are illegal and dangerous.
The mere passage of time (age) does not cause tires to deteriorate, but
rather exposure to outside forces. Such outside forces can include, but are
not limited to: road hazards, punctures, improper repairs, misalignment,
under inflated operation, over inflated operation, excessive heat caused
by over deflected operation, excessive exposure to ozone, improper
storage conditions, etc. Tire companies can only have an impact on a few
of these exposures. Tire companies add antiozinants and anti-oxidants
(anti-degradation compounds) to minimize degradation. Pirelli believes
that since there is no way to accurately predict what outside forces a tire
will be exposed to there is no scientifically supportable age limit that can
be set for tires.
To avoid cosmetic damage, use a mild soap solution to clean sidewalls
and rinse off with low-pressure tap water. Never apply cleaners or
dressings to enhance sidewall appearance to avoid removal of antioxi-
dants, which are intended to prevent ozone degradation. The removal of
anti-oxidants may degrade the rubber and can lead to sidewall cracking.
Use of high-pressure sprayers may cause sidewall damage.
WARNING!
Driving on a damaged tire is dangerous, as the tire can suddenly fail,
which can lead to an accident and serious personal injury or death.
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