PIRELLI
197
For Example:
Load Index Number: a numeric code which indicates the maximum
load carrying capacity of a tire at the maximum cold inflation pressure.
Speed Symbol: an alphabetical code which indicates the maximum
speed at which the tire can carry a load corresponding to its Load
Index when properly inflated. These two items together are known as
the “Service Description”.
Speed Symbol Chart
*For tires having a maximum speed capability above 149 mph, a “ZR”
may appear in the size designation; above 186 mph, a “ZR” must
appear in the size designation, and a Service Description, including the\
“Y” speed symbol, must be included in brackets.
Other Markings
•
P - As part of the tire size designation (e.g., P205/65R15), is used
to indicate tires intended for service on passenger cars.
•
LT - As part of the tire size designation (e.g. LT235/75R15), is used
to indicate the tires are intended for service on light truck vehicles.
•
M&S, M+S, M/S - Letters used to indicate a tire suitable for Mud
and Snow and/or All Season usage.
•
XL - As part of the size designation (e.g. P235/75R16 XL), is used
to indicate the tire can carry more load as the maximum inflation
PIRELLI
198
pressure and load are greater than a standard load version. (Also
could be called REINFORCED).
•
: 3 peak mountain snowflake pictograph used to indicate a tire
suitable for use in severe snow conditions.
Tire Categories
ALL SEASON TIRES (All Weather Tires): Tires that are designed to
perform in a variety of road conditions in All Seasons of the year. An
All Season tire will carry “M+S”, “M&S”, or “M/S” desi\
gnation on the
sidewall. All Season tires may carry a treadwear warranty depending
on the product line.
SUMMER TIRES: Summer tires offer superior handling, grip and
cornering ability compared to standard tires under certain conditions.
Some lines may carry a treadwear warranty.
WINTER TIRES (Snow Tires): A winter tire is a tire with a tread design
and compound made specifically for snow and ice conditions and
is identified by M&S, M+S or M/S markings on the sidewalls. Tires
designed for use in severe snow conditions are further identified with a
pictograph of a mountain with a snowflake on the sidewalls and must
meet specific snow performance test requirements. Pirelli Winter tires
do not carry a treadwear warranty.
The information provided above is an overview of tire types. Tread
patterns and rubber compounds vary among the seasonal tire types
and provide varying performance characteristics and limitations.
Summer performance tires are different than winter and All Season
types. To determine which Pirelli lines carry a treadwear warranty,
please refer to the “Treadwear Coverage” sections in this document.
Pressure Recommendations
Recommended tire inflation pressures for your vehicle can be found
either on your vehicle’s tire placard or in your owner’s manual. Correct
pressures are related to load, speed and vehicle handling and are
vital for even braking, maximum traction and good tire life. Under no
circumstances should your tires’ cold inflation pressure be less than
PIRELLI
199
that indicated on your vehicle’s tire placard or in your owner’s manual
or higher than the maximum cold inflation pressure molded on to the
tire’s sidewall. Under inflation causes excessive flexing, deterioration of
the tire and rapid wear of the tread edges. Over inflation results in an
uncomfortable ride, a reduced area of tire contact with the road surface\
(i.e., smaller tire footprint), higher susceptibility to impact damage and
rapid wear on the tread center. Whether inflated by air or nitrogen,
regular inflation pressure maintenance remains critical and necessary.
Use of nitrogen alone is not a replacement for regular inflation
pressure maintenance.
WARNING: Driving on tires with improper inflation pressure is
dangerous. These situations can cause a tire failure, including
tread/belt separation, even at a later date, which could lead to an
accident and serious personal injury or death.
Inflation pressure must be checked at least once a month and before
long trips, and should be checked only when the tire is cold or before i\
t
has been driven. Driving even a short distance causes tires to heat up
and the air pressure to increase. Never reduce or “bleed” air from\
hot
tires since your tires will then be underinflated when they cool down.
Always use a reliable pressure gauge.
UHP Summer Tires
The special tread compounds formulated for Ultra High Performance
(UHP) summer tires are optimized for maximum dry and wet
performance in warm temperatures. The compounds in these tires will
have decreased performance, such as lateral and braking traction, at
temperatures below 45° F or when driving on snow or ice. In addition,\
they can lose flexibility and may develop random surface cracks
at very cold temperatures; therefore extra care should be used in
handling tires. All Season or winter tires should be installed for use at
temperatures below 45° F, UHP summer tires are not recommended
for lower temperature conditions.
DOT Street Legal Competition Tires
P Zero Trofeo, P Zero Trofeo R, P Zero Corsa and P Zero Corsa
System tire lines use special tire construction and compounds to
PIRELLI
200
achieve their distinctive performance in dry conditions. As a result of
that, their performance in cold temperatures, heavy rain or standing
water will be decreased. Use extreme caution and drive slowly on wet
roads. Additionally, the minimum tread depth will be reached earlier
than with standard road tires, resulting in reduced tread life.
Winter Tires
In low temperature conditions, Pirelli recommends the fitment of
4 winter tires of the same line. Please check your vehicle owner’s
manual concerning winter tire size recommendation. If the winter tires
have a lower speed rating than the original equipment tires, vehicle
handling may be affected, and the vehicle maximum speed must be
reduced to the winter tire speed rating.
If using studded winter tires, Pirelli recommends that studded tires be \
installed on all four positions.
Please note that studded tires are not legal in all states. Please
check the applicable legal requirements before installing
studded tires.
Please note, for both winter tire and studded tire usage, if such tires \
are applied to the front axle, they must also be applied to the rear axle.
Run Flat Tires
Always refer to the vehicle owner’s manual with respect to specific
safety and operating information relating to the vehicle. Damaged Run
Flat tires or Run Flat tires that have experienced a loss of pressure
should immediately be replaced with another Run Flat tire of identical
size and Service Description (Load Index and Speed Symbol).
Run Flat tires have been developed based on the specifications of
the vehicles on which they are mounted. Accordingly, Run Flat tires
should only be mounted on vehicles specifically manufactured to
accommodate Run Flat tires.
Run Flat tires must be mounted in conjunction with a functional Tire
Pressure Monitoring System (TPMS).
PIRELLI
201
The mounting of tires and installation of the Tire Pressure Monitoring
System (TPMS) should be carried out by an authorized Pirelli dealer.
Pirelli “Seal Inside” Technology
Select Pirelli tires incorporate “Seal Inside” technology, a construction
designed to stop the loss of air from a tire in most circumstances when \
the tire is punctured by an object. The “Seal Inside” technology is
not designed or intended to be a permanent repair. Should the “Seal
Inside” technology be activated, immediately drive your vehicle to
an authorized Pirelli dealer for an inspection to determine if repair or\
replacement is needed. Go to www.us.pirelli.com for more information.
Pirelli Noise Canceling System
Select Pirelli tires are constructed with Pirelli Noise Canceling System\
(PNCS). This is a technology that reduces the tire cavity noise caused
by the vibration of the tire structure when rolling on the road surface,\
which is one of the major factors generating noise inside the vehicle.
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 unapproved tires on your vehicle could adversely affect
steering, handling, braking and traction. The tire information (tire size,
load index and speed rating) 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).
PIRELLI
202
On all wheel drive or four wheel drive vehicles the tires must always
be replaced in sets of four. When replacing tires, 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 check interchangeability to maintain proper
vehicle dynamics.
Please be aware that it is important, before fitting the suggested tires,
to confirm that the fitment is allowed by the technical specifications of
the vehicle, the vehicle manufacturer and the relevant homologations.
Pirelli does not express any view as to the compatibility of the wheel/
tire combination with the technical specifications for the chassis
and vehicle.
TO MAINTAIN VEHICLE DYNAMICS AND LOAD CARRYING
CAPACITY, REPLACEMENT TIRES MUST ALWAYS HAVE A LOAD
INDEX AND SPEED SYMBOL EQUAL TO OR GREATER THAN
THOSE FITTED AS ORIGINAL EQUIPMENT.
When installing plus size fitments, you should consult with the dealer
regarding any suspension or braking system modifications which may
be recommended for the vehicle.
Tire Inspection
As a minimum, tires 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 dealer and replaced if necessary.
Pirelli tires have treadwear indicators in the tread grooves, which
clearly show when the tread has worn to 2/32” remaining. At this point,
your tires must be replaced because they do not meet the federal
PIRELLI
203
minimum tread depth and they may be dangerous if left in service.
Tires should be removed from service for numerous reasons,
including tread worn down to minimum depth, damage or abuse
(including, without limitation, punctures, cuts, impacts, cracks, bulges,
under inflation, overloading, etc.). For these reasons, tires, including
spares, should be inspected at least once a month and before long
trips. Inspection should occur regardless of whether the vehicle is
equipped with a tire pressure monitoring system. In addition to these
visual conditions, consumers should take note of and address any
change in performance such as increased air loss, noise or vibration or \
other factors.
The mere passage of time (age) does not cause tires to deteriorate,
but rather exposure to outside forces. The service life of a tire is a
function of service and storage conditions. For each individual tire,
this service life is determined by many factors such as temperature/
weather, storage conditions, and service conditions (e.g., load, speed,
inflation pressure, maintenance, and road hazard damage, etc.) to
which a tire is subjected throughout its life. Since service and storage
conditions vary widely, accurately predicting the service life of any
specific tire based on chronological age is not possible. There is no
scientific or technical data that establishes or identifies a minimum
or maximum service life, but the longer a tire has been in service,
the greater the chance that it will need to be replaced due to service-
related conditions.
Only use a mild soap solution to clean tires and rinse the soap off with
low pressure tap water, use of high-pressure sprayers may cause
damage. Never apply cleaners or other products to enhance sidewall
or tire appearance to avoid removal of substances which are intended
to protect the tire and reduce rubber degradation associated with the
impact of ozone and other environmental conditions.
The removal of these substances may degrade the rubber and can
lead to sidewall cracking. To remove the protective film from a Pirelli
tire with white letters, first flood the area with a stream of water from a
hose. After a minute or two the film will soften and it can be removed
with soft nylon brush if needed.
PIRELLI
204
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.
Tire Rotation
Pirelli recommends that you follow the tire rotation procedure as
defined in your vehicle owner’s manual. If there is no procedure
specified, Pirelli recommends tire rotation every 5,000 to 7,000 miles to
optimize your tire wear.
Tire Repair
Punctures, nail holes or cuts located in the tread area of Pirelli
tires may be repaired if the diameter does not exceed 1/4”. The
repair material used must seal the inner liner and fill the injury to be
considered a permanent repair. U.S. Tire Manufacturers Association
and industry approved repair methods include a combination of a
plug and a patch; chemical or hot vulcanizing patches, and head type
plugs; all which are applied from inside the tire. A self-vulcanizing plug
repair may be used only in conjunction with a patch repair, but not
by itself. Plugs may cause further damage to the tire, are not always
airtight and may fail. If a tire puncture exceeds 1/4” or is located \
in the
shoulder or sidewall deflection areas, the tire must be replaced. Never
resort to tubes in tubeless tires or sleeves or large thick patches, whi\
ch
can upset the balance and may result in a sudden failure at highway
speeds and high operating temperatures.
WARNING: Driving on an improperly repaired tire is dangerous,
as the tire can suddenly fail, which can lead to an accident and
serious personal injury or death.
Pirelli Prohibits the Following for Safety Reasons:1.
The use of aftermarket tire sealants in Pirelli tires to repair, even
temporarily, a puncture;
2.
The repairing of V, W, Y or Z Speed Rated tires.