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8-1. Specifications
8
Vehicle specifications
*
:Table 1 Occupant loading and distribution for vehicle normal load for various desig-
nated seating capacities
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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