8-1. Specifications- Page 381

381

8-1. Specifications

8

Vehi

cle

 spec

ifi

ca

tions

Wheel diameter

Bead
Sidewall
Shoulder
Tread
Belt
Inner liner
Reinforcing rubber
Carcass
Rim lines
Bead wires
Chafer

This information has been prepared in 
accordance with regulations issued by 
the National Highway Traffic Safety 
Administration of the U.S. Department 
of Transportation.
It provides the purchasers and/or pro-
spective purchasers of Lexus vehicles 
with information on uniform tire quality 
grading.

Your Lexus dealer will help answer any 

questions you may have as you read this 
information.

■

DOT quality grades

All passenger vehicle tires must con-
form to Federal Safety Requirements 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

■

Treadwear

The treadwear grade is a comparative 
rating based on the wear rate of the tire 
when tested under controlled condi-
tions on a specified government 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 depends 
upon the actual conditions of their use. 
Performance may differ significantly from 
the norm due to variations in driving habits, 
service practices and differences in road 
characteristics 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 con-
trolled conditions on specified govern-
ment 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 

Tire section names

Uniform Tire Quality Grading

C

A
B
C
D

E
F

G
H

I

J

K