Jaguar XJ (2008 year). Manual — part 64

257

Wheels and Tires

R

Radio Frequency Approval

The TPMS transmitters and receivers
comply with Part 15 of the FCC rules and
RSS-210 of the industry Canada.

Operation is subject to the two following
conditions:

1. The device may not cause harmful

interference.

2. This device must accept any

interference received, including
interference that may cause
undesired operation.

Note: Changes or modifications not
expressly approved by the manufacturer
could void the user’s authority to operate
the equipment.

The TPMS radio frequency approval
numbers for the USA and Canada are:

USA FCCID: KR5S120123,
TX-KR55WK45057B RX-5WK4887.

Canada IC: 267T-S120123,
267T-5WK47594, CAN2671032336A.

Wheels and Tires

258

L

TIRE MARKINGS

P (1)

The P indicates the tire is for passenger
vehicles.

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.

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.

R (4)

The R stands for radial. Radial ply
construction of tires has been the industry
standard for the past 20 years.

Wheel diameter (5)

This two-digit number is the wheel or rim
diameter in inches. If you change your
wheel size, you will have to purchase new
tires to match the new wheel diameter.

Load index (6)

This two- or three-digit number is the
tire's load index. It is a measurement of
how much weight each tire can support.

Note: You may not find this information
on all tires because it is not required by
law.

JAG0395N

1

2

3

4

5

6

7

9

10

11

12

13

14

15

8

259

Wheels and Tires

R

Speed rating (7)

The speed rating denotes the speed at
which a tire is designed to be driven for
extended periods of time. The ratings
range from 99 miles per hour (mph) to 186
mph. These ratings are listed in the
following table.

Note: You may not find this information
on all tires because it is not required by
law.

U.S DOT tire identification number (8)

This begins with the letters DOT and
indicates that the tire meets all Federal
standards. The next two numbers or
letters are the plant code where it was
manufactured, and the last four numbers
represent the week and year the tire was
built. For example, the numbers 3197
means the 31st week of 1997. The other
numbers are marketing codes used at the
manufacturer's discretion. This
information can be used to contact
consumers if a tire defect requires a
recall.

M+S (9)

The M+S or M/S indicates that the tire has
some mud and snow capability. Most
radial tires have these markings: they
have some mud and snow capability.

Tire ply composition and materials
used (10)

The number of plies indicates the number
of layers of rubber-coated fabric in the
tire. In general, the greater the number of
plies, the more weight a tire can support.
Tire manufacturers also must indicate the
materials in the tire, which include steel,
nylon, polyester, and others.

Treadwear number (11)

This number indicates the tire's wear rate.
The higher the treadwear number is, the
longer it should take for the tread to wear
down. For example, a tire graded 400
should last twice as long as a tire graded
200.

For more information, refer to page 263.

Letter Rating

Speed Rating

Q

99 mph

R

106 mph

S

112 mph

T

118 mph

U

124 mph

H

130 mph

V

149 mph

W

168 mph

Y

186 mph*

* For tires with a maximum speed
capability over 149 mph, tire
manufacturers sometimes use the
letters ZR. For those with a maximum
speed capability over 186 mph, tire
manufacturers always use the letters
ZR.

Wheels and Tires

260

L

Traction letter (12)

This letter indicates a tire's ability to stop
on wet pavement. A higher graded tire
should allow you to stop your car on wet
roads in a shorter distance than a tire with
a lower grade. Traction is graded from
highest to lowest as AA, A, B, and C. For
more information, refer to page 263.

Maximum load rating (13)

This number indicates the maximum load
in kilograms and pounds that can be
carried by the tire.

Temperature letter (14)

This letter indicates a tire's resistance to
heat. The temperature grade is for a tire
that is inflated properly and not
overloaded. Excessive speed,
under-inflation or excessive loading,
either separately or in combination, can
cause heat build-up and possible tire
failure. From highest to lowest, a tire's
resistance to heat is graded as A, B, or C.
For more information, refer to page 263.

Maximum permissible inflation
pressure (15)

This number is the greatest amount of air
pressure that should ever be put in the tire
under normal driving conditions.

TIRE CARE

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 make have widely varying
characteristics. It is therefore
recommended that only Jaguar approved
tires are fitted to all wheels.

!

WARNING:

Always ensure replacement tires have
the correct rating and specifications
(e.g. load index, size, speed rating) for
your vehicle. Contact your Jaguar
Dealer for more information.

!

WARNING:

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