676
8-1. Specifications
*
:Table 1 Occupant loading and distribution for vehicle normal load for various desig-
nated seating capacities
Reinforced tire
A tire designed to operate at higher loads and at higher
inflation pressures than the corresponding standard tire
Section width
The linear distance between the exteriors of the sidewalls
of an inflated tire, excluding elevations due to labeling,
decoration, or protective bands
Sidewall That portion of a tire between the tread and bead
Sidewall separation
The parting of the rubber compound from the cord mate-
rial in the sidewall
Snow tire
A tire that attains a traction index equal to or greater than
110, compared to the ASTM E-1136 Standard Reference
Test Tire, when using the snow traction test as described
in ASTM F-1805-00, Standard Test Method for Single
Wheel Driving Traction in a Straight Line on Snow-and
Ice-Covered Surfaces, and which is marked with an
Alpine Symbol ( ) on at least one sidewall
Test rim
The rim on which a tire is fitted for testing, and may be any
rim listed as appropriate for use with that tire
Tread That portion of a tire that comes into contact with the road
Tread rib A tread section running circumferentially around a tire
Tread separation Pulling away of the tread from the tire carcass
Treadwear indicators (TWI)
The projections within the principal grooves designed to
give a visual indication of the degrees of wear of the tread
Wheel-holding fixture
The fixture used to hold the wheel and tire assembly
securely during testing
Designated seating capac-
ity, Number of occupants
Vehicle normal load, Num-
ber of occupants
Occupant distribution in a
normally loaded vehicle
2 through 4 2 2 in front
5 through 10 3 2 in front, 1 in second seat
11 through 15 5
2 in front, 1 in second seat, 1 in
third seat, 1 in fourth seat
16 through 20 7
2 in front, 2 in second seat, 2
in third seat, 1 in fourth seat
Tire related term Meaning
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