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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
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
Tire related term Meaning
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
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