Get Consumer information and Reporting safety defects -> Uniform tire quality grading standards Guide for Subaru XV SUV Second Generation (2017-2022)

13-14 Consumer information and Reporting safety defects/Uniform tire quality grading standards

Uniform tire quality grading

Example 2B

standards

S13AC

This information indicates the rela-

tive performance of passenger car

tires in the area of treadwear,

traction, and temperature resis-

tance. This is to aid the consumer

in making an informed choice in the

purchase of tires.

Quality grades can be found where

applicable on the tire sidewall be-

For example, if a person weighing

tween tread shoulder and maximum

143 lbs (65 kg) and a child weighing

2. Calculate the available load ca-

section width.

40 lbs (18 kg) now enter the same

pacity.

For example:

vehicle (bringing the number of

Treadwear 200 Traction AA Tem-

occupants to three), and a child

perature A

restraint system weighing 11 lbs (5

kg) is installed in the vehicle for the

The quality grades apply to new

child to use, the calculations are as

pneumatic tires for use on passen-

follows.

ger cars. However, they do not

1. Calculate the total weight.

3. The total weight now exceeds

apply to deep tread, winter type

the capacity weight by 32 lbs (15

snow tires, space-saver or tempor-

kg), so the cargo weight must be

ary use spare tires, tires with

reduced by 32 lbs (15 kg) or more.

nominal rim diameters of 12 inches

or less, or to some limited produc-

tion tires.

Consumer information and Reporting safety defects/Uniform tire quality grading standards 13-15

All passenger car tires must con-

under controlled conditions on spe-

excessive temperature can lead to

form to Federal Safety Require-

cified government test surfaces of

sudden tire failure.

ments in addition to these grades.

asphalt and concrete.

The grade C corresponds to a level

A tire marked C may have poor

of performance which all passenger

& Treadwear

traction performance.

car tires must meet under the

S13AC02

The treadwear grade is a compara-

Federal Motor Vehicle Safety Stan-

WARNING

tive rating based on the wear rate of

dards No. 109.

the tire when tested under con-

Grades B and A represent higher

The traction grade assigned to

trolled conditions on a specified

levels of performance on the la-

this tire is based on straight-

government test course.

boratory test wheel than the mini-

ahead braking traction tests,

For example, a tire graded 150

mum required by law.

and does not include accelera-

would wear one and one-half (1-

tion, cornering, hydroplaning,

WARNING

1/2) times as well on the govern-

or peak traction characteris-

ment course as a tire graded 100.

tics.

The temperature grade for this

The relative performance of tires

tire is established for a tire that

depends upon the actual conditions

is properly inflated and not

& Temperature A, B, C

of their use, however, and may

overloaded. Excessive speed,

S13AC04

depart significantly from the norm

The temperature grades are A (the

underinflation, or excessive

due to variations in driving habits,

highest), B, and C, representing the

loading, either separately or

service practices and differences in

tire9s resistance to the generation of

in combination, can cause

road characteristics and climate.

heat and its ability to dissipate heat

heat buildup and possible tire

when tested under controlled con-

failure.

& Traction AA, A, B, C

ditions on a specified indoor labora-

S13AC03

The traction grades, from highest to

tory test wheel.

lowest, are AA, A, B and C. Those

Sustained high temperature can

grades represent the tire9s ability to

cause the material of the tire to

stop on wet pavement as measured

degenerate and reduce tire life, and

Consumer information and Reporting safety defects -> Uniform tire quality grading standards for Your Subaru XV SUV Second Generation (2017-2022)

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