Uniform Tire Quality Grading - Mitsubishi i-MiEV 2011 Owner's Manual

Customer assistance/Reporting Safety Defects
Consumer information (For vehicles sold in
This information is provided in compliance with the require-
ments of the National Highway Traffic Safety Administration,
Department of Transportation. It provides the purchasers
and/or prospective purchasers with information on reporting
safety defects.

Uniform tire quality grading

DOT quality grades - All passenger vehicle tires must conform
to Federal Safety Requirements in addition to these grades. The
specific grade rating in each grade category is shown on the
side wall of the tires on your vehicle.
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 (1
government course as a tire graded 100. The relative perfor-
mance 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 AA, A, B, C
The traction grades, from highest to lowest, are AA, A, B and
8
C. Those grades represent the tire's ability to stop on wet pave-
ment as measured under controlled conditions on specified
government test surfaces of asphalt and concrete. A tire
marked C may have poor traction performance.
8-2
U.S.A.)
1
/ ) times as well on the
2
WARNING
!
The traction grade assigned to this tire is based on
N01047100171
straight-ahead braking traction tests, and does not
include acceleration, cornering, hydroplaning, or
peak traction characteristics.
Temperature A, B, C
The temperature grades are A (the highest), B and C, represent-
ing the tire's resistance to the generation of heat and its ability
to dissipate heat when tested under controlled conditions on a
specified indoor laboratory test wheel. Sustained high tempera-
ture can cause the material of the tire to degenerate and reduce
tire life, and excessive temperature can lead to sudden tire fail-
ure. The grade C corresponds to a level of performance which
all passenger car tires must meet under the Federal Motor Vehi-
cle Safety Standard No. 109. Grades B and A represent higher
levels of performance on the laboratory test wheel than the
minimum required by law.
WARNING
!
The temperature grade for this tire is established for
a tire that is properly inflated and not overloaded.
Excessive speed, underinflation, or excessive load-
ing, either separately or in combination, can cause
heat buildup and possible tire failure.