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542
8-1. Specifications
Tire related term
Test rim
Tread
Tread rib
Tread separation
Treadwear indicators (TWI)
Wheel-holding fixture
*
: Table 1 -Occupant loading and distribution for vehicle normal load for various desig-
nated seating capacities
Designated seating capac-
ity, Number of occupants
2 through 4
5 through 10
11 through 15
16 through 20
The rim on which a tire is fitted for testing, and may
be any rim listed as appropriate for use with that tire
That portion of a tire that comes into contact with
the road
A tread section running circumferentially around a
tire
Pulling away of the tread from the tire carcass
The projections within the principal grooves
designed to give a visual indication of the degrees
of wear of the tread
The fixture used to hold the wheel and tire assembly
securely during testing
Vehicle normal load, Num-
ber of occupants
2
3
5
7
Meaning
Occupant distribution in a
normally loaded vehicle
2 in front
2 in front, 1 in second seat
2 in front, 1 in second seat, 1 in
third seat, 1 in fourth seat
2 in front, 2 in second seat, 2
in third seat, 1 in fourth seat
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