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8-1. Specifications
*
:Table 1 Occupant loading and distribution for vehicle normal load for various desig-
nated seating capacities
Section width
The linear distance between the exteriors of the sidewalls of an
inflated tire, excluding elevations due to labeling, decoration, or pro-
tective bands
Sidewall That portion of a tire between the tread and bead
Sidewall separation
The parting of the rubber compound from the cord material in the
sidewall
Snow tire
A tire that attains a traction index equal to or greater than 110, com-
pared to the ASTM E-1136 Standard Reference Test Tire, when
using the snow traction test as described in ASTM F-1805-00, Stan-
dard 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 indica-
tors (TWI)
The projections within the principal grooves designed to give a visual
indication of the degrees of wear of the tread
Wheel-holding fix-
ture
The fixture used to hold the wheel and tire assembly securely during
testing
Designated seating capacity,
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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