Get Minor repairs -> Tyres and wheels Guide for Porsche Cayenne SUV First Generation (2002-2010)

292 Minor Repairs

Tyres and wheels

In addition to correct tyre filling pressure and

correct wheel alignment, the service life of the

tyres also depends on your driving style.

Abrupt acceleration, high cornering speeds and

heavy braking increase tyre wear. The tread wear

is also greater at higher outside temperatures and

on rough road surfaces.

Just like the engine, tyres always require the cor-

rect operating conditions. When correctly treated,

they are a long-lived safety component on your

Porsche.

For your own protection and that of other road

users, you must observe the following instruc-

tions.

We recommend inspecting the tyres for damage

after off-road driving.

Load and speed

f Do not overload your vehicle. Be careful about

the roof load. There is a danger from

overloading

+ insufficient tyre pressure

+ high speed

+ high outside temperature

(e.g. holiday driving).

Tyre pressure

The tyre pressure must match the prescribed

value.

You can find information on the tyre pressure:

– In the front left door aperture.

– In the Technical Data chapter in this Driver’s

Manual:

Please observe the chapter “TYRE

PRESSURES, COLD” on Page 367.

These values are for cold tyres (20 °C).

f Check the tyre pressure at least every

2 weeks. Always check when tyres are cold.

f On vehicles with Tyre Pressure Monitoring:

Please observe the chapter “SETTING TYRE

PRESSURE MONITORING” on Page 135.

When tyres are warm, the tyre pressure is

increased.

f Never let air out of hot tyres. This could cause

the tyre pressure to fall below the prescribed

value.

Valve caps protect the valve from dust and dirt,

and thus from leakage.

f Always screw caps down tightly.

f Replace missing caps immediately.

Insufficient tyre pressure can cause tyres to

overheat and thus be damaged – even invisibly.

Hidden tyre damage is not eliminated by subse-

quently correcting the tyre pressure.

Tyre damage

Cleaning with high-pressure cleaners can damage

the tyres.

f For further information on cleaning with high-

pressure cleaners:

Please observe the chapter “HIGH-PRESSURE

CLEANING UNITS” on Page 282.

Warning!

Risk of accident due to hidden tyre damage.

Tyres may burst, especially at high speeds.

f Check tyres including the sidewalls regularly

for foreign bodies, nicks, cuts, cracks and

bulges.

f Cross kerb edges slowly and at right angles if

possible.

Avoid driving over steep or sharp kerbs.

f In cases of doubt, have the wheel (particularly

the inner side) checked by an expert.

Minor Repairs 293

In the case of the following tyre damage, the tyre

must be replaced for safety reasons:

– Tyre damage where the possibility of a ply

fracture cannot be ruled out.

– If the tyre has been thermally and mechanically

overloaded following a loss of pressure or

other previous damage.

Maintenance note

Tyre repairs are not permissible under any circum-

stances.

f After driving off-road, examine tyres for signs

of damage such as cuts, tears, bulges or

foreign objects stuck in the tread and replace

if necessary.

Kerbs

Heavy or sharp-angled impacts against kerbs or

sharp-edged objects (e.g. stones) can cause

hidden tyre damage that only shows up later.

Depending on the strength of the impact, the rim

flange may also be damaged.

Storing wheels

f Always store wheels in cool, dry, dark condi-

tions. Tyres without wheels should be stored in

a standing position.

f Avoid contact with petrol, oil and grease.

In no case should tyres be more than 6 years

old.

The idea that tyres become more wear-resistant

with storage and age has no foundation.

Chemical additives that make the rubber elastic

lose their effect in the course of time and the

rubber becomes brittle. The age of a tyre can be

seen from the DOT code on the tyre sidewall.

If, for example, the last four digits are 1206, this

means: the tyre was manufactured in the twelfth

week of 2006.

Tread

The less tread, the greater the danger of

aquaplaning.

f For safety reasons, replace the tyres before

the wear indicators appear (webs in the tyre

grooves, 1.6 mm high).

f Check tyre tread regularly, particularly before

and after long journeys.

Wheel balancing

f As a precaution, have wheels with summer

tyres balanced in the spring, and those with

mud and snow tyres before winter.

Only specified weights may be used for wheel

balancing.

Self-adhesive weights must not come into contact

with cleaning agents, since they could drop off.

Wheel change

f When wheels are removed, mark the direction

of rotation and position of each wheel.

Example:

FR (front right), FL, RR and RL.

f Always fit the wheels in accordance with their

marking.

294 Minor Repairs

Wheel alignment

Uneven tread wear indicates incorrect wheel align-

ment. In this case, the vehicle should be checked.

f Consult a qualified specialist workshop. We

recommend that you use a Porsche partner for

this work since these are staffed with trained

personnel and have the necessary parts and

tools.

Warning!

Risk of accident. You can lose control of the

vehicle.

If, during a journey, uneven running or vibra-

tions occur that could be caused by damage

to tyres or the car:

f Reduce speed immediately, but without

braking sharply.

f Stop the vehicle and check the tyres.

If no cause for the fault can be found, drive

carefully to the nearest qualified specialist

workshop.

We recommend that you use a Porsche

partner for this work since these are staffed

with trained personnel and have the necessary

parts and tools.

Replacing tyres

f Before having new tyres fitted, find out about

the current approval status.

f Use only tyre makes tested and approved by

Porsche.

Basically, only tyres of the same make, same

type and with the same specification number

(e.g. “N0”, “N1” ...) may be fitted.

In the initial period, new tyres do not have their full

grip.

f Therefore, do not drive above moderate

speeds during the first 100 to 200 km

(60 to 120 miles).

If new tyres are fitted to only one axle, the

different tread depths on the two axles can cause

a marked change from the previous driving behav-

iour to which you have become accustomed. This

is particularly true when new tyres are fitted to the

rear axle.

The effect is reduced continuously, however, as

tyre mileage increases.

f Adapt your driving style to the changed

handling.

Tyres should only be fitted by specialist firms.

When a defective tyre is replaced, it should be

noted that deviations in tread depth must not

exceed 30 % on one axle.

f Do not use second-hand tyres if you do not

know their history.

Valves

f Use only plastic valve caps.

Rubber valves must be replaced whenever the

tyres are changed.

In the case of metal valves, please observe the

fitting and replacement instructions.

Use only genuine Porsche metal valves or valves

of the same quality, which are manufactured

according to the specifications and production

demands of Porsche.

f Protect valve inserts against soiling with valve

caps.

Soiled valve inserts can cause a gradual loss

of air.

Minor Repairs 295

Sticker for maximum speed

Winter tyres

Warning!

Risk of accident due to excessive speed.

f Always observe the permissible maximum

speed of the respective tyre.

f A sticker showing the maximum permissible

speed must be affixed in the driver’s field of

vision.

Observe the country-specific laws.

f Fit winter tyres to both axles in good time

before the cold season begins.

Your Porsche partner will be pleased to advise

you.

Maintenance note

We recommend fitting winter tyres on the vehicle

at temperatures below 7 °C since the driving

performance of summer tyres is reduced at low

temperatures. Summer tyres may be permanently

damaged at extremely low temperatures.

Winter tyres lose their suitability when their tread

depth falls below 4 mm.

f Please note that in addition to winter tyres, all-

season and all-terrain tyres also belong to the

category M+S tyres.

Wheel change

f When wheels are removed, mark the direction

of rotation and position of each wheel.

Example: FR (front right), FL, RR and RL.

f Always fit the wheels in accordance with their

marking.

Snow chains

Optimal handling characteristics can be achieved

only when snow chains are fitted on all four wheels

of the vehicle. It is also possible to fit snow chains

on only one axle (preferably the rear axle).

f Remove spacers if 18 inch tyres, snow chains

or a collapsible spare wheel are mounted.

Caution!

Risk of damage to the wheel housings if the

spacers on the rear axle are not removed

before fitting snow chains.

f The 17 mm spacers must always be removed

from the rear axle when snow chains are to be

fitted.

f For information on the spacers:

Please observe the chapter “SPACERS” on

Page 299.

For information on removing the spacers:

Please observe the chapter “CHANGING A

WHEEL WITH REMOVAL OF 17 MM SPACERS”

on Page 309.

f Use only the fine-link snow chains recom-

mended and authorised by Porsche so that

sufficient clearance between the wheel well

and the chain is assured.

296 Minor Repairs

f For information on approved snow chains:

Please observe the chapter “TYRES, RIMS,

TRACKS” on Page 365.

f Before fitting chains, remove accumulated ice

and snow from the wheel well.

f Observe the maximum permissible speed

when using snow chains of 50 km/h

(30 mph).

Minor Repairs 297

A - Nominal width in mm

B - Cross-section ratio in %

C - Belt type code letter for radial

D - Rim diameter in inches

E - Load rating code number

F - Speed code letter

Inscription on radial tyre

Speed code letters

The speed code letter F indicates the maximum

permissible speed for the tyre.

This code letter is shown on the tyre sidewall.

T = up to 190 km/h (118 mph)

H = up to 210 km/h (131 mph)

V = up to 240 km/h (149 mph)

W = up to 270 km/h (167 mph)

Y = up to 300 km/h (186 mph)

Tip on driving

f Tyres with a maximum speed rating that is

lower than the specified maximum vehicle

speed may be mounted only if they bear an

M+S identification on the tyre sidewall.

Please note that in addition to winter tyres, all-

season and all-terrain tyres are also subject to

speed limits and bear this identification.

Inscription on light alloy wheels

The rim width in inches G and the rim offset L are

visible from the outside. This information can be

found near the tyre valve.

G - Rim width in inches

H - Rim-flange contour code letter

I - Symbol for drop-centre rim

J - Rim diameter in inches

K - Double hump

L - Rim offset in mm

Minor repairs -> Tyres and wheels for Your Porsche Cayenne SUV First Generation (2002-2010)

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