2018 SUBARU WRX Owners Manual

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北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
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Extra load tire
A tire designed to operate at higher
loads and higher inflation pressure
than the corresponding standard
tire..
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 always
face outward when mounting ona 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 inflation
pressure..
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.
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北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
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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 the
load..
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 pro-
tective bands..
Sidewall
That portion of a tire between the
tread and bead..
Sidewall separation
The parting of the rubber compound
from the cord material in the side-
wall..
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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北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
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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 the
vehicle’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 appended
to the end of this section) and
dividing by 2.
.
Wheel-holding fixture
The fixture used to hold the wheel
and tire assembly securely during
testing.
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北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
Table 1—Occupant loading and distribution for vehicle normal load for
various designated seating capacities
Designated seating
capacity, number of
occupantsVehicle normal load,
number of occupantsOccupant distribution in a
normally loaded vehicle
2 through 4 2 2 in front.
5 through 10 32 in front, 1 in second
seat.
11 through 15 52 in front, 1 in second
seat, 1 in third seat, 1 in
fourth seat.
16 through 22 72 in front, 2 in second
seat, 2 in third seat, 1 in
fourth seat.
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北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
&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’s tread wear in-
dicator 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
vehicle control can lead to an
accident.
.
Replace any damaged or un-
evenly worn tires at the time of
rotation. For information about the
tire rotation order, refer to“
Tire
rotation”F11-36.
After tire rotation,
adjust the tire pressures and make
sure the wheel nuts are correctly
tightened. For information aboutthe tightening torque and tighten-
ing sequence for the wheel nuts,
refer to“
Flat tires”F9-5.
&Vehicle load limit–how to
determineThe 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.
The vehicle placard also shows
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 roof rack or bike carrier, etc.
Therefore cargo capacity can be
calculated by the following method.
Cargo capacity = Load limit(totalweight of occupants + total weight
of optional equipment)
For information about vehicle load-
ing, refer to“
Loading your vehicle”
F8-11.CAUTION
Your vehicle is neither de-
signed nor intended to be
used for trailer towing. There-
fore, never tow a trailer with
your vehicle.
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北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
!Calculating total and load capa-
cities varying seating config-
urationsCalculate the available load capa-
city as shown in the following
examples:Example 1AVehicle capacity weight of the ve-
hicle 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 oneoccupant 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 1BFor example, if a person weighing
176 lbs (80 kg) now enters the same
vehicle (bringing the number of
occupants to two), the calculations
are as follows.1.
Calculate the total weight.
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北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
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
CAUTION
Your vehicle is neither de-
signed nor intended to be
used for trailer towing. There-
fore, never tow a trailer with
your vehicle.
Vehicle capacity weight of the ve-
hicle is 800 lbs (363 kg), which is
indicated on the vehicle placard
with the statement“The combined
weight of occupants and cargo
should never exceed 363 kg or
800 lbs”.
For example, the vehicle has one
occupant weighing 165 lbs (75 kg)
plus cargo weighing 265 lbs (120
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 172 lbs (78 kg) of cargo can
be carried.
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北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
Example 2B
CAUTION
Your vehicle is neither de-
signed nor intended to be
used for trailer towing. There-
fore, never tow a trailer with
your vehicle.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 thechild 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 22 lbs (10
kg), so the cargo weight must bereduced by 22 lbs (10 kg) or more.
&Determining compatibility of
tire and vehicle load capaci-
tiesThe 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’s maximum
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 each
axle’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.
The GVWR and front and rear
GAWRs are determined by not only
the maximum load rating of tires but
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