Subaru BRZ Manuals 2014 BRZ Owner's Manual | Page 440

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