Jaguar XK. Manual — part 56

227

Wheels and tires

R

Damage

Excessive local distortion can cause the
casing of a tire to fracture and may lead
to premature failure. Tires should be
examined especially for cracked walls,
exposed cords, etc. Flints and other
sharp objects must be removed from the
tire tread; if left in they may work through
the cover. Clean off any oil or grease
contamination by using a suitable
cleaner.

Tire repair

Damaged tires should be replaced with
new tires. They must not be repaired in
view of the high performance capability of
the vehicle.

Tire replacement

When replacing tires, it is preferable to fit
a complete vehicle set. If either front or
rear tires only need to be renewed, new
tires must be fitted as axle sets.

After new tires have been fitted the
wheels need to be dynamically balanced.

Do not fit tires with a different tread
pattern, size or speed rating.

The installation of replacement tires with
steel cord body plies in the tire sidewall
may cause malfunction of the TPMS and
is not recommended (cord material
information is moulded on the tire wall).

Additionally, if your vehicle was equipped
with run-flat tires, replacing them with
tires that are not identical to those
originally fitted may cause malfunction of
the TPMS and is not recommended.

Always check your TPMS indicator after
replacing one or more tires on your
vehicle. See TIRE PRESSURE
MONITORING SYSTEM (TPMS)
(page 238).

Tire ageing

Tires degrade over time, even when they
are not being used. It is recommended
that tires generally be replaced after six
years of normal service. Heat caused by
hot climates or frequent high loading
conditions can accelerate the ageing
process.

You should replace the spare tire when
you replace the other road tires due to the
ageing of the spare tire.

USING WINTER TIRES

Winter tires are more suitable during
extremes of low temperatures, snow and
ice and will considerably improve the
vehicle’s handling during these
conditions.

Do not exceed 240 km/h (150 mph) when
using Jaguar approved winter tires.

Winter tires must be fitted on all four
wheels.

Approved Winter tire sizes

Front: Dunlop Wintersport M3 -
245/45R18 96V, Pirelli Sotto Zero -
245/45R18 100V, Pirelli Sotto Zero -
255/35R20 97V .

Rear: Dunlop Wintersport M3 -
265/40R18 97V, Pirelli Sotto Zero -
275/40R18 103V, Pirelli Sotto Zero -
285/30R20 99V .

CAUTION

Do not use paraffin (kerosene),
because this has a detrimental
effect on rubber.

Wheels and tires

228

L

Winter tire pressures

USING SNOW CHAINS

Snow chains, of the recommended type,
can only be fitted to rear wheels. They
should not be used on temporary use
spare wheels.

You should contact your Jaguar Dealer
for details and availability of approved
snow chains.

The maximum speed when using snow
chains is 48 km/h (30 mph).

Remove the snow chains immediately the
roads are clear of snow.

Ensure the fitting instructions supplied
with the snow chains are kept in a safe
place, for example, with this literature
pack.

CHANGING A ROAD WHEEL

If a wheel change is required, pull off the
road completely. Park on ground which is
as level and solid as possible. Ensure that
the vehicle is clear of any objects that will
obstruct the safe removal of the wheel.
Switch on hazard warning lamps and,
where legally required, display the
warning triangle.

Regular maintenance of tires contributes
not only to safety, but to the designed
function of the vehicle. Road-holding,
steering and braking are especially
vulnerable to incorrectly pressurised,
badly fitted or worn tires.

Up to 240km/h (150 mph)

Front

2.0 bar (30 psi, 207 kPa)

Rear

2.3 bar (33 psi, 230 kPa)

WARNING

Trac DSC must be switched ON
when using snow chains. DSC
would reduce the deep snow

traction capability as it would limit wheel
spin to a level below that which is
required to generate maximum traction.

CAUTION

Do not fit snow chains to 20 inch
tires.

WARNINGS

Always ensure replacement tires
have the correct rating and
specifications (e.g. load index,

size, speed rating) for your vehicle.

When using tires other than those
recommended by Jaguar, do not
exceed the speed capacity

recommended by the manufacturer.

Wheels are extremely heavy. Take
care when lifting and particularly
when removing and replacing a

wheel in its storage position in the
luggage compartment.

The vehicle jack supplied with
your vehicle should only be used
when changing a wheel in

emergency situations.

Before using the vehicle jack
check that it is not damaged or
deformed and that the thread is

lubricated and free from foreign matter.

229

Wheels and tires

R

Tires of the correct size and type, but of
different make can have widely varying
characteristics. It is therefore
recommended that Jaguar approved tires
are fitted to all wheels.

Temporary use spare wheel

Observe the following warnings before
using the wheel:

CAUTION

Ultra high performance tires.

This vehicle is equipped with an

Ultra High Performance (UHP) tire and
wheel combination designed to give
maximum dry road performance with
consideration for aquaplaning
resistance. UHP tires have performance
enhancing soft rubber tread compound.
If driven aggressively they may suffer
rapid tread wear and a shorter life than
can be expected from other tire types.
This wheel and tire combination is more
susceptible to damage from road
hazards.

Do not use this combination for driving
on snow or ice. High performance tires
must be replaced with winter tires when
weather conditions dictate.

CAUTION

Tires with an all season icon or
M+S have a level of winter
performance and need not be

replaced.

WARNINGS

Note the temporary use spare
wheel warning label. Adhere to
instructions on the label. Failure to

comply can be dangerous.

When a temporary use spare
wheel is fitted, drive with caution
and replace with the specified

wheel and tire as soon as possible.

Do not fit more than one
temporary use spare wheel and
tire assembly at one time.

The temporary use spare wheel
must be inflated to 4.2 bar (60 psi,
420 kPa) and cannot be repaired.

Temporary use spare wheel,
maximum speed is 80 km/h (50
mph).

If the vehicle is fitted with tire
Pressure Monitoring System
(TPMS) See TIRE PRESSURE

MONITORING SYSTEM (TPMS)
(page 238).

DSC must be ON when the
temporary use spare wheel is in
use.

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230

L

Locking wheel nuts

Vehicles may be equipped with a locking
wheel nut on each wheel. These are
similar to standard wheel nuts, and can
only be removed using the special
adaptor provided with the jacking
equipment.

1. Insert the adaptor firmly onto the

locking wheel nut.

2. Using the wheel brace, unscrew the

wheel nut and adaptor.

3. Return the locking wheel nut adaptor

to the correct storage position.

Note: A code number is stamped on the
side of the locking nut. Ensure the
number is recorded on the Security Card
supplied with the literature pack. Quote
this number if a replacement is required.
Do not keep the Security Card in the
vehicle.

Spare wheel location

The spare wheel and jacking equipment
are stored under the luggage
compartment floor panel.

To remove the spare wheel, remove the
luggage compartment floor panel and the
tray containing the jacking equipment.
Unscrew the spare wheel retaining Tee
bolt and remove the spare wheel.

Remove the jack and wheel nut wrench
from the stowage tray.

Note: Examine the jack occasionally and
clean and grease the threads to ensure it
is always ready for an emergency.

E91709

E91710