568 9-1 . Specifications
Sidewall
Sidewall separation
Snow tire
Test rim
Tread
Tread rib
Tire related term
Tread separation
Treadwear indicators ( TWI )
Wheel-holding fixture
Meaning
That portion of a tire between the tread and bead
The parting of the rubber compound from the cord material in the sidewall
A tire that attains a traction index equal to or greater than 110 , compared to the ASTM E- 1136-93 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
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
* : 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
2 in front , 1 in second seat