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Tire related term
A tire that attains a
traction index equal
to or greater than
110, compared to the
ASTM E-1136 Stan-
dard Reference Test
Tire, when using the
snow traction test as
described in ASTM
F-1805-00, Stan-
Snow tire
dard Test Method
for Single Wheel
Driving Traction in a
Straight Line on
Snow-and Ice-Cov-
ered Surfaces, and
which is marked with
an Alpine Symbol
(
one sidewall
The rim on which a
tire is fitted for test-
ing, and may be any
Test rim
rim listed as appro-
priate for use with
That portion of a tire
Tread
that comes into con-
tact with the road
A tread section run-
Tread rib
ning circumferen-
tially around a tire
Pulling away of the
Tread separation
tread from the tire
Meaning
Tire related term
Treadwear indica-
tors (TWI)
Wheel-holding fix-
*
: Table 1—Occupant loading and distribu-
tion for vehicle normal load for various
designated seating capacities
Designated
seating
capacity,
) on at least
Number of
occupants
2 through 4
5 through 10
that tire
11 through 15
16 through
20
carcass
10-1. Specifications
Meaning
The projections
within the principal
grooves designed to
give a visual indica-
tion of the degrees
of wear of the tread
The fixture used to
hold the wheel and
tire assembly
ture
securely during test-
ing
Occupant
Vehicle nor-
distribution
mal load,
in a normally
Number of
loaded vehi-
occupants
2
2 in front
2 in front, 1 in
3
second seat
2 in front, 1 in
second seat,
5
1 in third seat,
1 in fourth
seat
2 in front, 2
in second
7
seat, 2 in
third seat, 1 in
fourth seat
579
cle
10
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