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Tire dimensions
■
Section width
A
Tire height
B
Wheel diameter
C
Tire section names
Bead
A
Sidewall
B
Shoulder
C
Tread
D
Belt
E
Inner liner
F
Reinforcing rubber
G
Carcass
H
Rim lines
I
Bead wires
J
Chafer
K
10-1. Specifications
Uniform Tire Quality Grading
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, however, and may depart sig-
nificantly from the norm due to varia-
573
10
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