Lexus SC 430 2006 Owner's Manual page 330

Tire section names
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 prospective purchasers of Lexus vehi-
cles 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 conform 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: Tread wear 200 Traction AA Temperature A
Bead
1
Sidewall
2
Shoulder
3
Tread
4
Belt
5
Inner liner
6
Reinforcing rubber
7
Carcass
8
Rim lines
9
Bead wires
10
Chafer
11
6-1. Specifications
317
6