Department Of5 Transportation Uniform Tire Quality Grades; Traction Grades; Treadwear - Alfa Romeo Giulia 2017 Owner's Manual

All Wheel Drive (AWD) Models
It is recommended to avoid situations
with a large difference in wear between
the front and rear tires and to strictly
use winter tires of the sizes given on the
tire placard.
The AWD system and the original tires
are developed together to ensure the
vehicle's best performance. When
changing the tires, it is recommended
to us the same "AR" marked tires, to
maintain the same level of performance
and component life.
DEPARTMENT OF
TRANSPORTATION
UNIFORM TIRE
QUALITY GRADES
The following tire grading
categories were established by the
National Highway Traffic Safety
Administration. The specific grade
rating assigned by the tire's
manufacturer in each category is
shown on the sidewall of the tires
on your vehicle.
All passenger vehicle tires must
conform to Federal safety
requirements in addition to these
grades.

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 one-half
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 significantly from
the norm due to variations in driving
habits, service practices, and
differences in road characteristics
and climate.

Traction Grades

The Traction grades, from highest
to lowest, are AA, A, B, and C.
These grades represent the tire's
ability to stop on wet pavement, as
measured under controlled
conditions on specified government
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 straight-ahead
braking traction tests, and does
not include acceleration,
cornering, hydroplaning, or peak
traction characteristics.
Temperature Grades
The temperature grades are A (the
highest), B, and C, representing the
tire's resistance to the generation of
heat and its ability to dissipate heat,
235