tires Lexus GX470 2007 Using other driving systems /

390
6-1. Specifications
Tire information
Ty p i c a l t i r e s y m b o l s
Tire size(P. 3 9 2 )
DOT and Tire Identification Number (TIN) ( P. 391)
Location of tread wear indicators ( P. 302)
Tire ply composition and materials
Plies are layers of rubber-coated parallel cords. Cords are the strands
which form the plies in a tire.
Radial tires or bias-ply tires
A radial tire has RADIAL on the sidewall. A tire not marked RADIAL is a
bias-ply tire.
TUBELESS or TUBE TYPE
A tubeless tire does not have a tube an d air is directly filled in the tire. A
tube type tire has a tube inside the ti re and the tube maintains the air pres-
sure.
Load limit at maximum cold tire inflation pressure ( P. 395)
Maximum cold tire inflation pressure ( P. 395)
This means the pressure to which a tire may be inflated.
Uniform tire quality grading
For details, see “Uniform Tire Quality Grading” that follows.

393
6-1. Specifications
6
Vehicle specifications
Tire section namesBead
Sidewall
Shoulder
Tread
Belt
Inner liner
Reinforcing rubber
Carcass
Rim lines
Bead wires
Chafer
Uniform Tire Quality GradingThis information has b een prepared in accordance with regulations
issued by the National Highway Tr affic Safety Administration of the
U.S.A. Department of Transportation.
It provides the purchasers and/or prospective purchasers of Lexus vehi-
cles with information on uniform tire quality grading.
Your Lexus dealer will help answer an y questions you may have as you read
this information.
■ DOT quality grades
All passenger vehicle tires must co nform to Federal Safety Require-
ments in addition to these grades. Quality grades can be found where
applicable on the tire sidewall between tread shoulder and maximum
section width.
For example: Treadwear 200 Traction AA Temperature A

394
6-1. Specifications
■Treadwear
The treadwear grade is a comparative rating based on the wear rate of
the tire when tested under controll ed conditions on a specified gov-
ernment test course.
For example, a tire graded 150 would wear one and a half (1 - 1 /2) times as
well on the government course as a tire graded 100.
The relative performance of tires de pends upon the actual conditions of
their use, however, and may depart significantly from the norm due to varia-
tions in driving habits, service practices and differences in road characteris-
tics and climate.
■ Traction AA, A, B, C
The traction grades, from highest to lowest, are AA, A, B and C, and
they represent the tire's ability to stop on wet pavement as measured
under controlled condit ions on specified government test surfaces of
asphalt and concrete.
A tire marked C may have poor traction performance.
Warning: The traction grade assigned to this tire is based on braking
(straight ahead) traction tests and does not include cornering (turning) trac-
tion.
■ Temperature A, B, C
The temperature grades are A (the highest), B, and C, representing
the tire's resistance to the generation of heat and its ability to dissipate
heat when tested under controlled conditions on a specified indoor
laboratory test wheel.
Sustained high temperature can cause the material of the tire to degenerate
and reduce tire life, and excessive temperature can lead to sudden tire fail-
ure.
The grade C corresponds to a level of performance which all passenger car
tires must meet under the Federal Mo tor Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of performance on the laboratory
test wheel than the minimum required by law.

412
Alphabetical index
Steering wheelAdjustment............................................... 35
Audio switches .................................... 198
Driving position memory...................24
Storage feature......................................228
Stuck If your vehicle becomes stuck..... 375
Sun visors .................................................233
Switch “2nd STRT” switch ............................... 99
Center differential lock switch ........121
“DAC” switch ....................................... 130
Fog light switch .......................................113
Height control off switch.................. 123
Light switches ........................................... 111
Power door lock switch ........................6
Power window switch .......................... 41
“RSCA OFF” switch............................ 68
Window lock switch ............................. 41
Wipers and washer switch ...............114
Tail lights Switch ........................................................... 111
Theft deterrent system Alarm ............................................................ 51
Theft prevention labels .......................... 53
Tire inflation pressure ........................ 385
Tire information Glossary.................................................395
Size ........................................................... 392
Tire identification number ...............391
Uniform Tire Quality Grading.... 393 Tires
Chains....................................................... 147
Checking............................................... 302
If you have a flat tire ......................... 356
Inflation pressure ............................... 385
Information ........................................... 390
Pressure warning system .............. 302
Replacing .............................................. 356
Rotating tires........................................ 302
Size ........................................................... 385
Snow tires................................................ 148
Tools........................................................... 356
Total load capacity .................................144
Towing Dinghy towing ......................................160
Emergency towing ........................... 339
Trailer towing ........................................150
Trip information display ...................... 108
Trip meter ................................................. 103
Turn signal lights Replacing light bulbs ......................... 331
Switch ..........................................................101
Wattage ................................................. 386
Vanity lights Vanity lights...........................................234
Wattage ................................................. 386
Vanity mirrors ............................................234
Vehicle identification number......... 379
Vehicle load limits ..................................144
VSC (Vehicle Stability Control) ......132
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