670 9-1. Specifications
Tire related term Tread separation
Treadwear indicators( TWI)
Wheel-holding fixture
Meaning 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
*: Table 1 � Occupant loading and distribution for vehicle normal load for various designated seating capacities
Designated seating capacity, Number of occupants
Vehicle normal load, Number of occupants
Occupant distribution in a normally loaded vehicle
2 through 4 2 2 in front
5 through 10 3
11 through 15 5
16 through 22 7
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