Jaguar SEMCON JLR XJ - Manual (Page 177)

R
(FM8) SEMCON JLR OWNER GUIDE VER 1.00 NAS
LANGUAGE: english-NAS-en; MARQUE: jaguar; MODEL: XJ
Tires
177
10. The number of plies in both the tread area,
and the sidewall area, indicates how many
layers of rubber coated material make up
the structure of the tire. Information is also
provided on the type of materials used.
11. Wear rate indicator. A tire rated at 400 for
example, will last twice as long as a tire
rated at 200.
12. The traction rating grades a tire’s
performance when stopping on a wet road
surface. The higher the grade the better the
braking performance. The grades from
highest to lowest are, AA, A, B and C.
13. The maximum load which can be carried by
the tire.
14. Heat resistance grading. The tire’s
resistance to heat is grade A, B or C, with A
indicating the greatest resistance to heat.
This grading is provided for a correctly
inflated tire, which is being used within its
speed and loading limits.
15. The maximum inflation pressure for the
tire. This pressure should not be used for
normal driving.
SPEED RATINGS
TIRE CARE
Do not drive the vehicle if a tire is damaged,
excessively worn, or incorrectly inflated. A
tire in such a condition may catastrophically
fail and cause an accident.
Avoid contaminating the tires with vehicle
fluids as they may cause damage to the tire
and cause a tire failure, which can result in
an accident.
Avoid spinning the wheels. The forces
released can damage the structure of the tire
and cause it to fail.
If wheel spin is unavoidable due to a loss of
traction (in deep snow, for example), do not
exceed the 30 mph (50 km/h) point on the
speedometer. Do not allow anyone to stand
near, or directly behind a tire that might spin.
Do not exceed the maximum pressure stated
on the sidewall of the tire.
TIRE PRESSURES
Never drive your vehicle if the tire pressures
are incorrect. Under-inflation causes
excessive flexing and uneven tire wear. This
can lead to sudden tire failure. Over-inflation
causes harsh ride, uneven tire wear and poor
handling.
Rating Speed, mph (km/h)
Q 99 (160)
R 106 (170)
S 112 (180)
T 118 (190)
U 124 (200)
H 130 (210)
V 149 (240)
W 168 (270)
Y 186 (300)