9-1. Specifications
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Tire section names
A Bead Sidewall Shoulder Tread Belt Inner liner Reinforcing rubber Carcass Rim lines Bead wires Chafer
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 SUBARU vehicles with information on uniform tire quality grading.
Your SUBARU retailer will help answer any questions you may have as you read this information.
n DOT quality grades
All passenger vehicle tires must conform 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
n Treadwear
The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions 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.
n 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 conditions on specified govern-
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Vehicle specifications