20
individual tire that is determined by distributing to each
axle its share of the curb weight, accessory weight,
and normal occupant weight (distributed in accordance
with Table I of CRF 49 571.110) and dividing by 2.
Weather side:
The surface area of the rim not covered
by the inflated tire.
Wheel center member:
In the case of a non-pneumatic
tire assembly incorporating a wheel, a mechanical
device which attaches, either integrally or separably,
to the non-pneumatic rim and provides the connection
between the nonpneumatic rim and the vehicle; or,
in the case of a non-pneumatic tire assembly not
incorporating a wheel, a mechanical device which
attaches, either integrally or separably, to the non-
pneumatic tire and provides the connection between
tire and the vehicle.
Wheel-holding fixture:
The fixture used to hold the
wheel and tire assembly securely during testing.
3.5 t
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The National Traffic Safety Administration (NHTSA)
has published a brochure (DOT HS 809 361) that
discusses all aspects of Tire Safety, as required by
CFR 575.6. This brochure is reproduced in part below.
It can be obtained and downloaded from NHTSA, free
of charge, from the following web site:
http://www.nhtsa.dot.gov/cars/rules/TireSafety/
ridesonit/tires_index.html
Studies of tire safety show that maintaining proper tire
pressure, observing tire and vehicle load limits (not
carrying more weight in your vehicle than your tires
or vehicle can safely handle), avoiding road hazards,
and inspecting tires for cuts, slashes, and other
irregularities are the most important things you can do
to avoid tire failure, such as tread separation or blowout
and flat tires. These actions, along with other care and
maintenance activities, can also:
•
Improve vehicle handling
•
Help protect you and others from avoidable
breakdowns and accidents
•
Improve fuel economy
•
Increase the life of your tires.
This booklet presents a comprehensive overview of tire
safety, including information on the following topics:
•
Basic tire maintenance
Rim diameter:
This means the nominal diameter of
the bead seat.
Rim size designation:
This means the rim diameter
and width.
Rim type designation:
This means the industry of
manufacturer’s designation for a rim by style or code.
Rim width:
This means the nominal distance between
rim flanges.
Section width:
The linear distance between the
exteriors of the sidewalls of an inflated tire, excluding
elevations due to labeling, decoration, or protective
bands.
Sidewal
l: That portion of a tire between the tread and
bead.
Sidewall separation:
The parting of the rubber
compound from the cord material in the sidewall.
Special Trailer (ST) tire:
The “ST” is an indication the
tire is for trailer use only.
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.
Vehicle capacity weight:
The rated cargo and luggage
load plus 68 kilograms (150 lbs.) times the vehicle’s
designated seating capacity.
Vehicle maximum load on the tire:
The load on an
individual tire that is determined by distributing to each
axle its share of the maximum loaded vehicle weight
and dividing by two.
Vehicle normal load on the tire:
The load on an
Tire Safety
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