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Tire Pressures
Tire Information
Tire Information
Tires of the correct type, manufacture and
dimensions, with correct cold inflation
pressures are an integral part of every
vehicle’s design. 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.
Tires of the correct size and type, but of
different makes, have widely varying
characteristics. It is therefore
recommended that only Jaguar approved
tires are fitted to all wheels.
Tire Pressures
The tire pressures recommended provide
optimum ride and handling
characteristics for all normal operating
conditions. The pressures should be
checked and correctly set each week,
with the tires cold.
Tire temperatures and pressures increase
when running. Deflating a warm tire to the
recommended pressure will result in
under-inflation which may be dangerous.
!
WARNING:
•
Under-inflation causes excessive
flexing and uneven wear to the tire.
This can lead to sudden failure.
Over-inflation causes a harsh ride,
uneven tire wear and poor handling.
!
WARNING:
•
Always ensure replacement tires
have the correct rating and
specifications (e.g. load index, size,
speed rating) for your vehicle.
Contact your Jaguar Retailer for
more information.
•
Pressure checks should only be
carried out when the tires are cold
(the vehicle has been stationary for
three hours or more).
Tire pressure label
(Canada and Mexico only)
A tire recommendation label is visible on
the end of the dashboard on the driver’s
side of the vehicle, giving information
specific to the vehicle’s wheel and tire
equipment.
•
When using tires other than those
recommended by Jaguar, do not
exceed the speed capacity
recommended by the
manufacturer.
Tire glossary
Refer to page 189 for a glossary of terms
and definitions associated with tire
pressures and vehicle weights.
178
R
Tire Pressures
Tire pressure label/placard (USA only)
A tire information label is visible on the
pillar behind the driver’s door (also known
as the ‘B’ pillar), giving information
specific to the wheel and tire equipment
fitted to the vehicle when it was built. The
label contains the following information:
•
•
The vehicle capacity weight (
4
), which
includes the weight of the driver,
passengers and cargo.
•
Cold inflation pressures for the spare
tire (
5
) and the front and rear tires (
6
).
The maximum number of occupants
(
1
), divided between the front (
2
) and
rear (
3
) of the vehicle.
•
The size of the tires (
7
) with which the
vehicle was originally equipped.
Note:
The label must not be changed,
even if different wheels are fitted at a
later stage.
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Tire Pressures
Recommended Tire Pressures
The following table gives the tire
pressures for all recommended tire sizes.
Tire Size
Tire Pressure
Front
Rear
205/55 R16
38 psi, 260 kPa
35 psi, 240 kPa
225/45 R17
38 psi, 260 kPa
35 psi, 240 kPa
225/40 R18
40 psi, 280 kPa
35 psi, 240 kPa
Space-saver spare wheel (front or rear)
60 psi, 420 kPa
Checking tire pressures
The following procedure should be used
to check and adjust the tire pressures:
1.
Remove the valve cover.
2.
Firmly attach a tire pressure
gauge/inflator to the valve.
3.
Read the tire pressure from the
gauge. If required, add air to the tire.
4.
If air is added to the tire, remove the
gauge from the valve and reattach it
before checking that the pressure is
correct. Failure to remove and
reattach the gauge from the valve
could cause the gauge to show an
incorrect reading.
5.
If too much air is added, remove the
gauge from the valve and allow air out
of the tire by pressing the centre of the
valve. Reconnect the gauge to the
valve, and check that the air pressure
is correct.
6.
Refit the valve cover.
A slight natural pressure loss occurs with
time. If this exceeds 2 psi (14 kPa) per
week, the cause should be investigated
and rectified.
Note:
It is an offence in certain countries
to drive a vehicle with tires that are not
inflated in accordance with the vehicle’s
proper use.
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Tire Pressures
‘R’ Performance Wheels
It is recommended that only Jaguar
approved winter tires are used,
as follows:
Pirelli 205/55R 16
or
Continental 205/55R 16
Pirelli 225/45R 17
Tire directional indicators must be
rotating in a clockwise direction when
viewed from the right-hand side of the
vehicle, and anti-clockwise when viewed
from the left-hand side of the vehicle.
Do not exceed 130 mph (210 km/h) when
using Jaguar approved winter tires.
Winter tires must be used in vehicle sets,
that is, fitted on all four wheels.
The recommended tire pressures for
winter tires are the same as shown on
page 180.
If non-Jaguar approved winter tires are
fitted, refer to the tire pressure
information label, attached to the end of
the dashboard on the driver’s side of the
vehicle (Canada and Mexico) or the pillar
behind the driver’s door (USA).
Some wheels have a slotted valve cover
on the wheel face. A pouch containing a
special tool and a valve adaptor, for use
with these wheels, is stowed in the glove
compartment.
To access the valve, unscrew the slotted
valve cover using the special tool (
1
).
Screw in the adaptor (
2
) and
hand-tighten.
After checking the pressure, remove the
adaptor and refit the valve cover.
The special tool will grip the valve cover,
making it easier to refit.
Winter (Snow) Tires
The tires fitted as original equipment are
designed with a rubber compound, tread
pattern and width specially suited for high
speeds in normal road conditions,
but they are less suitable during extremes
of low temperatures, snow and ice.
The use of winter tires will considerably
improve the vehicle’s handling during
these conditions.
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Tires
Tires
Tire Markings
P (1)
The ‘P’ indicates the tire is for passenger
vehicles.
Aspect ratio (3)
This two-digit number, known as the
aspect ratio, gives the tire's ratio of height
to width (this is also known as the tire
profile). The lower the number, the shorter
the tire’s sidewall.
Tire width (2)
This three-digit number gives the width in
millimetres of the tire from sidewall edge
to sidewall edge. In general, the larger the
number, the wider the tire.
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