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Recommended inflation pressure means the proper
Cold Inflation Pressure as shown on the Tire Information
label.
Reinforced tire means a tire designed to operate at
higher loads and at higher inflation pressures than the
corresponding standard tire.
Rim means a metal support for a tire or a tire and tube
assembly upon which the tire beads are seated.
Rim diameter means nominal diameter of the bead seat.
Rim size designation means rim diameter and width.
Rim type designation means the industry of
manufacturer's designation for a rim by style or code.
Rim width means nominal distance between rim flanges.
Section width means the linear distance between the
exteriors of the sidewalls of an inflated tire, excluding
elevations due to labeling, decoration, or protective
bands.
Sidewall means that portion of a tire between the tread
and bead.
Sidewall separation means the parting of the rubber
compound from the cord material in the sidewall.
ST tire means a tire designed for use only on trailers
drawn on a road.
Test rim means the rim on which a tire is fitted for testing,
and may be any rim listed as appropriate for use with that
tire.
Tread means that portion of a tire that comes into contact
with the road.
Tread rib means a tread section running circumferentially
around a tire.
Tread separation means pulling away of the tread from
the tire carcass.
Treadwear indicators (TWI) means the projections
within the principal grooves designed to give a visual
indication of the degrees of wear of the tread.
Vehicle capacity weight means the rated cargo and
luggage load plus 68 kilograms times the vehicle's
designated seating capacity.
Vehicle maximum load on the tire means that 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 means that load on an
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 49 CFR 571.110) and dividing by 2.
Wheel center member means, 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 non-pneumatic rim and the
vehicle; or in the case of a nonpneumatic 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 the
tire and the vehicle.
Wheel-holding fixture means the fixture used to hold the
wheel and tire assembly securely during testing.
4. Tire Safety - Everything Rides On It
The National Traffic Safety Administration (NHTSA) has
published a brochure (DOT HS 809 361) that discusses
all aspects of Tire Safety, as required by 49 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
•
Uniform Tire Quality Grading System
•
Fundamental characteristics of tires
•
Tire safety tips. Use this information to make tire
safety a regular part of your vehicle maintenance
routine.
Recognize that the time you spend is minimal compared
with the inconvenience and safety consequences of a flat
tire or other tire failure.
Safety First–Basic Tire Maintenance
Properly maintained tires improve the steering, stopping,
traction, and load-carrying capability of your vehicle.
Underinflated tires and overloaded vehicles are a major
cause of tire failure. Therefore, as mentioned above, to
avoid flat tires and other types of tire failure, you should
maintain proper tire pressure, observe tire and vehicle
load limits, avoid road hazards, and regularly inspect your
tires.
Finding Your Vehicle's Recommended Tire Pressure
And Load Limits
Tire information placards and vehicle certification labels
contain information on tires and load limits. These labels
indicate the vehicle manufacturer's information including:
•
Recommended tire size
•
Recommended tire inflation pressure
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