6-1. Specifications
Tire related term
Snow tire
Meaning
A tire that attains a traction index equal to or
greater than 110, compared to the ASTM E1136 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 (
least one sidewall
) on at
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
*: Table 1
Occupant loading and distribution for vehicle normal load
for various designated seating capacities
6
Vehicle specifications
439