Uniform Tire Quality Grading - Lotus Evora 400 2018 Owner's Handbook Manual

WHEELS & TIRES
C. Tube or tubeless type tire: Indi-
cates if an inner tube is required
to inflate the tire.
D. Tire structure: Indicates that the
tire has a radial structure.
E. Maximum load rating: Displays
maximum load that can be sup-
ported by the tire.
F. Maximum pressure rating: Dis-
plays maximum load that can be
supported by the tire.
G. Tire composition and material:
Displays the number of plies in
the tire tread and sidewall and the
materials used.
H. Uniform Tire Quality Grading;
This is described in the following
information.
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E132T0324JA Federal Evora 400 From SOP OHB English Language.indd 96

Uniform Tire Quality Grading

The following information relates
to the system developed by the
United States National Highway
Traffic Safety Administration,
which grades tires by treadwear,
traction and temperature perform-
ance. The grades are moulded on
the sidewalls of most passenger
car tires between the tread shoul-
der and maximum section width.
For example:
Treadwear 180 Traction AA
Temperature A
Treadwear
The treadwear grade is a com-
parative rating based on the wear
rate of the tire when tested under
controlled conditions on a speci-
fied government test course. For
example, a tire graded 150 would
wear one and one-half (11/2) 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, however, and may depart
significantly from the norm due to
variations in driving habits, service
practices and differences in road
characteristics and climate.
Traction
The traction grades, from high-
est to lowest, are AA, A, B, and C.
Those grades represent the tire's
ability to stop on wet pavement as
measured under controlled condi-
tions 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.
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