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6-1. Specifications
6
Vehicle specifications
Tire related term Meaning
Snow tire
A tire that attains a traction index equal to or greater
than 110, compared to the ASTM E-1136 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
Te st rim
The rim on which a tire is fitted for testing, and may be
any rim listed as appropriate for use with that tire
Tre a d
That portion of a tire that comes into contact with the
road
Tre a d r i b
A tread section running circumferentially around a
tire
Tre a d s e p a r a ti o n 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
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