2003 SUBARU IMPREZA WRX wheel size

Seat, seatbelt and SRS airbags
1-66
Precautions against vehicle modifica- tion
WARNING
To avoid accidental activation of the system
or rendering the system inoperative, which
may result in serious injury, no modifications should be made to any components or wiring of the SRS airbag system.This includes following modifications: Installation of custom steering wheels
Attachment of additional trim materials to
the dashboard Installation of custom seats (for vehicles
with SRS side airbags only) Replacement of seat fabric or leather (for
vehicles with SRS side airbags only) Installation of additional fabric or leather
on the front seat (for vehicles with SRS side airbags only)
Installation of additional electrical/electronic
equipment such as a mobile two-way radio on or near the SRS airbag system componentsand/or wiring is not advisable. This could in-
terfere with proper operation of the SRS air- bag system.
CAUTION
Do not perform any of the following modifica- tions. Such modifications can interfere with proper operation of the SRS airbag system. Attachment of any equipment (brush bar,
winches, snow plow, skid plate, etc.) otherthan SUBARU genuine accessory parts to thefront end. Modification of the suspension system or
front end structure. Installation of a tire of different size and
construction from the tires specified on thetire placard attached to the driver ’s door jamb.
Attachment of any equipment (side steps or
side sill protectors, etc.) other than SUBARU genuine accessory parts to the side body (for
vehicles with side airbags only).
Always consult your SUBARU dealer if you want to
install any accessory parts to your vehicle.

Starting and operating
7-21
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Rear viscous limited slip differential (LSD) (WRX)
The LSD provides optimum distribution of power ac-
cording to the difference in revolutions between the
right and left rear wheels that may be caused by
certain driving conditions, thereby improving driving
stability on snow-covered, muddy or other slippery
roads.
CAUTION
Never start the engine while a tire on one
side is jacked up, as the vehicle may move. If one rear tire is spinning in mud, avoid
continued spinning at high speed as thiscould adversely affect the LSD. If a different size rear tire is temporarily
used (as in an emergency), it will adversely af-fect the LSD. Always replace it with a regularsize tire as soon as possible. Power steering The power steering system operates only when the
engine is running.If you lose power steering assist because the en-gine stops or the system fails to function, you can
steer but it will take much more effort. NOTE Right after the engine has been started and be- fore it has warmed up, you may hear a noisecoming from areas adjacent to the power steer-
ing pump which is located at the right-front area of the engine compartment. This noise is normal. It does not indicate power steering systemtrouble.
CAUTION
Do not hold the steering wheel at the fully
locked position left or right for more than five
seconds. This may damage the power steer- ing pump.

Driving tips
8-7
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safety purposes as well as to avoid damaging the
AWD system, you should keep the following tips inmind: An AWD vehicle is better able to climb steeper
roads under snowy or slippery conditions than a two
wheel drive vehicle. There is little difference in han-
dling, however, during extremely sharp turns or sud-
den braking. Therefore, when driving down a slope
or turning corners, be sure to reduce your speed
and maintain an ample distance from other vehicles. When replacing a tire, make sure you use only the
same size, construction, brand, and load range as
the original tires listed on the tire placard. Using other
sizes, circumference or construction may result in se-
vere mechanical damage to the drive train of your ve-
hicle and may affect ride, handling, braking,
speedometer/odometer calibration, and clearance
between the body and tires. It also may be danger-
ous and lead to loss of vehicle control. If you use a temporary spare tire to replace a flat
tire, be sure to use the original temporary spare tire
stored in the vehicle. Using other sizes may result in
severe mechanical damage to the drive train of your
vehicle. Always check the cold tire pressure before start-
ing to drive. The recommended tire pressure is pro-
vided on the tire placard, which is located under the door latch on the driver
’s side.
Tire chains should always be placed on the front
wheels only. There are some precautions that you must ob-
serve when towing your vehicle. For detail informa-
tion, see the “Towing” section in chapter 9.
WARNING
Always maintain a safe driving speed ac-
cording to the road and weather conditions in order to avoid having an accident on a sharp turn, during sudden braking or under othersimilar conditions. Always use the utmost care in driving –
overconfidence because you are driving an allwheel drive vehicle could easily lead to a seri- ous accident.

Driving tips
8-14
gerous and lead to loss of vehicle control. You must install four winter tires that are of
the same size, construction, brand, and loadrange. Mixing other sizes or constructions
may result in severe mechanical damage to
the drive train of your vehicle and may affect
ride, handling, braking and speedometer/ odometer calibration. It also may be danger-ous and lead to loss of vehicle control. Do not use a combination of radial, belted
bias or bias tires since it may cause danger-ous handling characteristics and lead to an accident.
Your vehicle is equipped with “all season tires ” as
original equipment, which are designed to provide
an adequate measure of traction, handling and
braking performance in year-round driving. In winter,
it may be possible to enhance performance through
use of tires designed specifically for winter drivingconditions.
The optional 17-inch tires for the WRX are summer
tires. Compared with winter and all-season tires,
summer tires give significantly less grip on snowy
and icy road surfaces. Therefore, use of winter tires
is strongly recommended when driving with such
road conditions. When you choose to install winter tires on your ve-
hicle, be sure to use the correct tire size and type.
You must install four winter tires that are of the samesize, construction, brand and load range and you
should never mix radial, belted bias or bias tires
since this may result in dangerous handling charac-
teristics. When you choose a tire, make sure that
there is enough clearance between the tire and ve-
hicle body.
Remember to drive with care at all times regardless
of the type of tires on your vehicle.
Tire chains
Driving on snowy grades or icy roads may require
the use of tire chains, in which case put the chains
on the front wheels only. Use only SAE class S type
chains that are of the correct size for your tires so asnot to damage the vehicle body or suspension.
When driving with tire chains, drive at speeds below 19 mph (30 km/h).
When a temporary spare tire is on a front wheel, re-
place the temporary spare tire with the rear tire onthe same side of the vehicle, and then fit chains on
the front tires.
Always use the utmost care when driving with tire

Driving tips
8-27
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Trailer towing
Your car is designed and intended to be used pri-
marily as a passenger-carrying vehicle. Towing a
trailer puts additional loads on your car ’s engine, dri-
vetrain, brakes, tires and suspension and has an
adverse effect on fuel economy.
If you do decide to tow a trailer, your safety and sat-
isfaction depend upon proper use of correct equip-
ment and cautious operation of your vehicle. Seekthe advice of your SUBARU dealer to assist you in
purchasing a hitch and other necessary towing
equipment appropriate for your vehicle. In addition,
be sure to follow the instructions on correct installa-
tion and use provided by the trailer and other towing
equipment manufacturers.
SUBARU assumes no responsibility for injuries or
vehicle damage that result from trailer towing equip-
ment, or from any errors or omissions in the instruc- tions accompanying such equipment or for your fail-
ure to follow the proper instructions. Warranties and maintenance
SUBARU warranties do not apply to vehicle damage or malfunction caused by trailer towing. If you use
your vehicle to tow a trailer, more frequent mainte-
nance will be required due to the additional load. (Refer to
“Maintenance schedule under severe driv-
ing conditions ” in the “Warranty and Maintenance
Booklet”.)
Under no circumstances should a trailer be towedwith a new vehicle or a vehicle with any new power-
train component (engine, transmission, differential, wheel bearings, etc.) for the first 1,000 miles (1,600 km) of driving. Maximum load limits
WARNING
Never exceed the maximum load limits ex-
plained below. Exceeding the maximum loadlimits could cause personal injury and/or ve-hicle damage.
CAUTION
Adequate size trailer brakes are required
when the trailer and its cargo exceed 1,000 lbs (453 kg) total weight. Before towing a trailer, check the trailer total
weight, GVW, GAWs and tongue load. Make sure the load and its distribution in your
vehicle and trailer are acceptable.

In case of emergency
9-4
1) Spare fuse
2) FWD connector
NOTE
(If your vehicle is AWD with automatic transmis-
sion, except Turbo models) Before driving your
vehicle with the temporary spare tire, put a spare fuse inside the FWD connector in the main fuse box located in the engine compartment and con-firm that the Front-wheel drive warning light
“FWD” in the combination meter comes on. The
all wheel drive capability of the vehicle has now
deactivated. After re-installing the conventional tire, remove the spare fuse from the FWD con- nector in order to reactivate all wheel drive.
WARNING
Never tow a trailer when the temporary spare tire is used. The temporary spare tire is not
designed to sustain the towing load. Use ofthe temporary spare tire when towing can result in failure of the spare tire and/or less
stability of the vehicle and may lead to anaccident.
CAUTION
Never use any temporary spare tire other than the original. Using other sizes may result in
severe mechanical damage to the drive trainof your vehicle.

Appearance care
10-3
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Do not wash the same area continuously.
If a stain will not come out easily, wash by hand.
Some warm water washers are of the high tempera-
ture, high pressure type, and they can damage or
deform the resin parts such as mouldings, or causewater to leak into the vehicle. Waxing and polishing
Always wash and dry the vehicle before waxing and polishing.Use a good quality polish and wax and apply them
according to the manufacturer ’s instructions. Wax or
polish when the painted surface is cool.
Be sure to polish and wax the chrome trim, as well
as the painted surfaces. Loss of wax on a painted
surface leads to loss of the original luster and also
quickens the deterioration of the surface. It is rec-
ommended that a coat of wax be applied at least
once a month, or whenever the surface no longer re-
pels water. If the appearance of the paint has diminished to the
point where the luster or tone cannot be restored,
lightly polish the surface with a fine-grained com-
pound. Never polish just the affected area, but in-
clude the surrounding area as well. Always polish in
only one direction. A No. 2000 grain compound is recommended. Never use a coarse-grained com-
pound. Coarser grained compounds have a smallergrain-size number and could damage the paint. Af-
ter polishing with a compound, coat with wax to re-
store the original luster. Frequent polishing with a
compound or an incorrect polishing technique will
result in removing the paint layer and exposing the
undercoat. When in doubt, it is always best to con-tact your SUBARU dealer or an auto paint specialist. NOTE Be careful not to block with windshield washer nozzles with wax when waxing the vehicle.
Cleaning aluminum wheels
Promptly wipe the aluminum wheels clean of any
kind of grime or agent. If dirt is left on too long, it
may be difficult to clean off. Do not use soap containing grit to clean the
wheels. Be sure to use a neutral cleaning agent, and
later rinse thoroughly with water. Do not clean the
wheels with a stiff brush or expose them to a high- speed washing device. Clean the vehicle (including the aluminum wheels)
with water as soon as possible when it has been
splashed with sea water, exposed to sea breezes, or
driven on roads treated with salt or other agents.

Maintenance and service
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After driving approximately 600 miles (1,000 km),
check the wheel nuts again and retighten any nutthat has become loose. Tire replacement
The wheels and tires are important and integral
parts of your vehicle ’s design; they cannot be
changed arbitrarily. The tires fitted as standard
equipment are optimally matched to the characteris-
tics of the vehicle and were selected to give the best
possible combination of running performance, ride
comfort, and service life. It is essential for every tireto have a size and construction matching those
shown on the tire placard and to have a speed sym-
bol and load index matching those shown on the tire
placard.
Using tires of a non-specified size detracts from
controllability, ride comfort, braking performance,
speedometer accuracy and odometer accuracy. It
also creates incorrect body-to-tire clearances and
inappropriately changes the vehicle ’s ground clear-
ance.
All four tires must be the same in terms of manufac-
turer, brand (tread pattern), construction, and size.
You are advised to replace the tires with new ones
that are identical to those fitted as standard equip- ment.
For safe vehicle operation, SUBARU recommends
replacing all four tires at the same time. NOTE
Unidirectional tires: Some tires have a specified direction of rotation. A tire of this type has an ar-
row or other mark on its side wall to indicate thedirection of rotation. Install it so that the direc-tion of rotation is correct when the vehicle isdriven forward.