SUBARU IMPREZA WRX 2014 4.G Owners Manual

13-6Consumer information and Reporting safety defects/Tire information
.Extra load tire
A tire designed to operate at higher
loads and higher inflation pressure
than the corresponding standardtire. . Groove
The space between two adjacent
tread ribs.. Innerliner
The layer(s) forming the inside sur-
face of a tubeless tire that contains
the inflating medium within the tire. . Innerliner separation
The parting of the innerliner from
cord material in the carcass.. Intended outboard sidewall
(1) The sidewall that contains a
whitewall, bears white lettering
or bears manufacturer, brand,
and/or model name molding that
is higher or deeper than the
same molding on the other side-
wall of the tire, or (2) The outward facing sidewall
of an asymmetrical tire that has
a particular side that must al-
ways face outward when mount- ing on a vehicle.
. Light truck (LT) tire
A tire designated by its manufac-
turer as primarily intended for use
on lightweight trucks or multipur-
pose passenger vehicles. . Load rating
The maximum load that a tire is
rated to carry for a given inflationpressure.. Maximum inflation pressure
The maximum cold inflation pres-
sure to which a tire may be inflated.. Maximum load rating
The load rating for a tire at the
maximum permissible inflation
pressure for that tire.. Maximum loaded vehicle weight
The sum of: (a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options weight
. Maximum permissible inflation
pressure
The maximum cold inflation pres-
sure to which a tire may be inflated. .
Measuring rim
The rim on which a tire is fitted for
physical dimension requirements. . Normal occupant weight
150 lbs (68 kg) times the number of
occupants specified in the second
column of Table 1 that is appended
to the end of this section. . Occupant distribution
Distribution of occupants in a vehi-
cle as specified in the third column
of Table 1 that is appended to the
end of this section. . Open splice
Any parting at any junction of tread,
sidewall, or innerliner that extends
to cord material. . Outer diameter
The overall diameter of an inflated
new tire.. Overall width
The linear distance between the
exteriors of the sidewalls of an
inflated tire, including elevations
due to labeling, decorations, or
protective bands or ribs.

.Passenger car tire
A tire intended for use on passen-
ger cars, multipurpose passenger
vehicles, and trucks, that have a
gross vehicle weight rating (GVWR)
of 10,000 lbs (4,535 kg) or less. . Ply
A layer of rubber-coated parallel cords.. Ply separation
A parting of rubber compound
between adjacent plies.. Pneumatic tire
A mechanical device made of rub-
ber, chemicals, fabric and steel or
other materials, that, when
mounted on an automotive wheel,
provides the traction and contains
the gas or fluid that sustains theload. . Production options weight
The combined weight of those
installed regular production options
weighing over 5.1 lbs (2.3 kg) in
excess of those standard items
which they replace, not previously
considered in curb weight or acces- sory weight, including heavy duty
brakes, ride levelers, roof rack,
heavy duty battery, and special trim.
. Radial ply tire
A pneumatic tire in which the ply
cords that extend to the beads are
laid at substantially 90 degrees to
the centerline of the tread. . Recommended inflation pres-
sure
The cold inflation pressure recom-
mended by a vehicle manufacturer. . Reinforced tire
A tire designed to operate at higher
loads and at higher inflation pres-
sures than the corresponding stan-
dard tire. . Rim
A metal support for a tire or a tire
and tube assembly upon which the
tire beads are seated. . Rim diameter
Nominal diameter of the bead seat. . Rim size designation
Rim diameter and width. .
Rim type designation
The industry of manufacturer ’s des-
ignation for a rim by style or code. . Rim width
Nominal distance between rim flanges. . Section width
The linear distance between the
exteriors of the sidewalls of an
inflated tire, excluding elevations
due to labeling, decoration, or
protective bands. . Sidewall
That portion of a tire between the
tread and bead.. Sidewall separation
The parting of the rubber com-
pound from the cord material in
the sidewall.. Test rim
The rim on which a tire is fitted for
testing, and it may be any rim listed
as appropriate for use with that tire.. Tread
That portion of a tire that comes
into contact with the road.
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13-8Consumer information and Reporting safety defects/Tire information
.Tread rib
A tread section running circumfer-
entially around a tire. . Tread separation
Pulling away of the tread from the
tire carcass. . Treadwear indicators (TWI)
The projections within the principal
grooves designed to give a visual
indication of the degrees of wear of
the tread. . Vehicle capacity weight
The rated cargo and luggage load
plus 150 lbs (68 kg) times thevehicle ’s designated seating capa-
city. . Vehicle maximum load on the
tire
Load on an individual tire that is
determined by distributing to each
axle its share of the maximum
loaded vehicle weight and dividing
by two. . Vehicle normal load on the tire
Load on an individual tire that is
determined by distributing to each
axle its share of the curb weight, accessory weight, and normal oc-
cupant weight (distributed in accor-
dance with Table 1 that is ap-
pended to the end of this section)
and dividing by 2.
. Wheel-holding fixture
The fixture used to hold the wheel
and tire assembly securely duringtesting.

Table 1—Occupant loading and distribution for vehicle normal load for
various designated seating capacities
Designated seating
capacity, number of
occupants Vehicle normal load,
number of occupants Occupant distribution in a
normally loaded vehicle
2 through 4 2 2 in front.
5 through 10 3 2 in front, 1 in second seat.
11 through 15 5 2 in front, 1 in second
seat, 1 in third seat, 1 in
fourth seat.
16 through 22 7 2 in front, 2 in second
seat, 2 in third seat, 1 in
fourth seat.
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13-10Consumer information and Reporting safety defects/Tire information
&Tire care –maintenance and
safety practices
. Check on a daily basis that the
tires are free from serious damage,
nails, and stones. At the same time,
check the tires for abnormal wear. . Inspect the tire tread regularly
and replace the tires before their
tread wear indicators become visi-
ble. When a tire ’streadwear
indicator becomes visible, the tire
is worn beyond the acceptable limit
and must be replaced immediately.
With a tire in this condition, driving
at even low speeds in wet weather
can cause the vehicle to hydro-
plane. Possible resulting loss of
vehiclecontrolcanleadtoanaccident. . To maximize the life of each tire
and ensure that the tires wear
uniformly, it is best to rotate the
tires every 7,500 miles (12,000 km).
For information about the tire rota-
tion order, refer to “Tire rotation ”
F 11-29 .
Replace any damaged or
unevenly worn tires at the time of rotation. After tire rotation, adjust
the tire pressures and make sure
the wheel nuts are correctly tigh-
tened. For information about the
tightening torque and tightening
sequence for the wheel nuts, refer to
“Flat tires ”F 9-5 .
& Vehicle load limit –how to
determine
The load capacity of your vehicle is
determined by weight, not by avail-
able cargo space. The load limit of
your vehicle is shown on the
vehicle placard attached to the
driver ’s side B-pillar. Locate the
statement “The combined weight
of occupants and cargo should
never exceed XXX kg or XXX lbs ”
on your vehicle ’s placard.
Thevehicleplacardalsoshows
seating capacity of your vehicle.
The total load capacity includes the
total weight of driver and all pas-
sengers and their belongings, any
cargo, any optional equipment such
as a trailer hitch, roof rack or bike carrier, etc., and the tongue load of
a trailer. Therefore cargo capacity
can be calculated by the following method.
Cargo capacity = Load limit
(total
weight of occupants + total weight
of optional equipment + tongue
load of a trailer (if applicable))
For information about vehicle load-
ing, refer to “Loading your vehicle ”
F 8-10 .
NOTE
Your vehicle is neither designed
nor intended to be used for
trailer towing. Therefore, never
tow a trailer with your vehicle.

!Calculating total and load ca-
pacities varying seating con-
figurations
Calculate the available load capa-
city as shown in the followingexamples:
Example 1A
Vehicle capacity weight of the
vehicle is 900 lbs (408 kg), which
is indicated on the vehicle placard
with the statement “The combined
weight of occupants and cargo
should never exceed 900 lbs or
408 kg ”.
For example, if the vehicle has one occupant weighing 154 lbs (70 kg)
plus cargo weighing 662 lbs (300 kg). 1.
Calculate the total weight.
2.Calculate the available load ca-
pacity by subtracting the total
weight from the vehicle capacity
weight of 900 lbs (408 kg).
3. The result of step 2 shows that a
further 84 lbs (38 kg) of cargo can
be carried. Example 1B
For example, if a person weighing
176 lbs (80 kg) now enters the
same vehicle (bringing the number
of occupants to two), the calcula-
tions are as follows. 1.
Calculate the total weight.
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13-12Consumer information and Reporting safety defects/Tire information
2.Calculate the available load ca-
pacity.
3. The total weight now exceeds
the capacity weight by 92 lbs (42
kg), so the cargo weight must be
reduced by 92 lbs (42 kg) or more.
Example 2A
Vehicle capacity weight of the
vehicle is 900 lbs (408 kg), which
is indicated on the vehicle placard with the statement
“The combined
weight of occupants and cargo
should never exceed 408 kg or
900 lbs ”.
For example, the vehicle has one
occupant weighing 165 lbs (75 kg)
plus cargo weighing 375 lbs (170
kg). In addition, the vehicle is fitted
with a trailer hitch weighing 22 lbs
(10 kg), to which is attached a
trailer weighing 1,764 lbs (800 kg).
10% of the trailer weight is applied
to the trailer tongue (i.e. Tongue
load = 176 lbs (80 kg)).
1. Calculate the total weight.
2. Calculate the available load ca-
pacity.
3. The result of step 2 shows that a
further 162 lbs (73 kg) of cargo can
be carried. NOTE
Your vehicle is neither designed
nor intended to be used for
trailer towing. Therefore, never
tow a trailer with your vehicle.

Example 2B
For example, if a person weighing
143 lbs (65 kg) and a child weighing
40 lbs (18 kg) now enter the same
vehicle (bringing the number of
occupants to three), and a child
restraint system weighing 11 lbs (5
kg) is installed in the vehicle for the
child to use, the calculations are as follows. 1.Calculate the total weight.
2.Calculate the available load ca-
pacity.
3. The total weight now exceeds
the capacity weight by 32 lbs (15
kg), so the cargo weight must be
reduced by 32 lbs (15 kg) or more. NOTE
Your vehicle is neither designed
nor intended to be used for
trailer towing. Therefore, never
tow a trailer with your vehicle. &
Determining compatibility of
tire and vehicle load capaci- ties
The sum of four tires ’maximum
load ratings must exceed the max-
imum loaded vehicle weight( “GVWR ”). In addition, sum of the
maximum load ratings of two front
tires and of two rear tires must
exceed each axle ’smaximum
loaded capacity ( “GAWR ”). Original
equipment tires are designed to
fulfill those conditions.
The maximum loaded vehicle
weight is referred to Gross Vehicle
Weight Rating (GVWR). And eachaxle ’s maximum loaded capacity is
referred to Gross Axle Weight Rat-
ing (GAWR). The GVWR and each axle ’s GAWR are shown on the
vehicle certification label affixed to
the driver ’s door.
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13-14Consumer information and Reporting safety defects/Tire information
The GVWR and front and rear
GAWRs are determined by not only
the maximum load rating of tires but
also loaded capacities of the vehi-cle’s suspension, axles and other
parts of the body.
Therefore, this means that the
vehicle cannot necessarily be
loaded up to the tire ’s maximum
load rating on the tire sidewall. & Adverse safety conse-
quences of overloading on
handling and stopping and
on tires
Overloading could affect vehicle
handling, stopping distance, and
vehicle and tire performance in the
following ways. This could lead to
an accident and possibly result in
severe personal injury. . Vehicle stability will deteriorate.
. Heavy and/or high-mounted
loads could increase the risk of
rollover. . Stopping distance will increase.
. Brakes could overheat and fail. .
Suspension, bearings, axles and
other body parts could break or
experience accelerated wear that
will shorten vehicle life.
. Tires could fail.
. Tread separation could occur.
. Tire could separate from its rim.
& Steps for Determining Cor-
rect Load Limit
1. Locate the statement “The com-
bined weight of occupants and
cargo should never exceed XXX
kg or XXX lbs. ”on your vehicle ’s
placard.
2. Determine the combined weight
of the driver and passengers that
will be riding in your vehicle. 3. Subtract the combined weight of
the driver and passengers from
XXX kg or XXX lbs. 4. The resulting figure equals the
available amount of cargo and
luggage load capacity. For exam-
ple, if the “XXX ”amount equals
1,400 lbs (635 kg) and there will be
five- 150 lbs (68 kg) passengers in your vehicle, the amount of avail-
able cargo and luggage load capa-
city is 650 lbs. (1,400
750 (5 6
150) = 650 lbs)
5. Determine the combined weight
of luggage and cargo being loaded
on the vehicle. That weight may not
safely exceed the available cargo
and luggage load capacity calcu-
lated in Step 4. 6. If your vehicle will be towing a
trailer, load from your trailer will be
transferred to your vehicle. Consult
this manual to determine how this
reduces the available cargo and
luggage load capacity of your ve-hicle. NOTE
Your vehicle is neither designed
nor intended to be used for
trailer towing. Therefore, never
tow a trailer with your vehicle.

Uniform tire quality grading standards
This information indicates the rela-
tive performance of passenger car
tires in the area of treadwear,
traction, and temperature resis-
tance. This is to aid the consumer
in making an informed choice in the
purchase of tires.
Quality grades can be found where
applicable on the tire sidewall be-
tween tread shoulder and maxi-
mum section width. For example:
Treadwear 200 Traction AA Tem-
perature A
The quality grades apply to new
pneumatic tires for use on passen-
ger cars. However, they do not
apply to deep tread, winter type
snow tires, space-saver or tempor-
ary use spare tires, tires with
nominal rim diameters of 12 inches
or less, or to some limited produc-
tion tires.
All passenger car tires must con-form to Federal Safety Require-
ments in addition to these grades.
& Treadwear
The treadwear grade is a compara-
tive rating based on the wear rate of
the tire when tested under con-
trolled conditions on a specified
government test course.
For example, a tire graded 150
would wear one and one-half (1-
1/2) times as well on the govern-
ment course as a tire graded 100.
The relative performance of tires
depends upon the actual conditions
of their use, however, and may
depart significantly from the norm
due to variations in driving habits,
service practices and differences in
road characteristics and climate. & Traction AA, A, B, C
The traction grades, from highest to
lowest, are AA, A, B and C. Those
grades represent the tire ’s ability to
stop on wet pavement as measured
under controlled conditions on spe- cified government test surfaces of
asphalt and concrete. A tire marked
C may have poor traction perfor- mance.
WARNING
The traction grade assigned to
this tire is based on straight-
ahead braking traction tests,
and does not include accel-
eration, cornering, hydroplan-
ing, or peak traction charac-teristics.
& Temperature A, B, C
The temperature grades are A (the
highest), B, and C, representing thetire ’s resistance to the generation of
heat and its ability to dissipate heat
when tested under controlled con-
ditions on a specified indoor labora-
tory test wheel. Sustained high
temperature can cause the material
of the tire to degenerate and reduce
tire life, and excessive temperature
can lead to sudden tire failure. The
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