Carcass means the tire structure except for the tread which provides the major portion of the tire's capability to deflect in response to the vertical loads and tractive forces that the tire transmits from the roadway to the non-pneumatic rim, the wheel center member, or the vehicle and which attaches to the vehicle or attaches, either integrally or separably, to the wheel center member or non-pneumatic rim.
Carcass separation means the pulling away of the carcass from the non-pneumatic rim or wheel center member.
Chunking means the breaking away of pieces of the carcass or tread.
Cracking means any parting within the carcass, tread, or any components that connect the tire to the non-pneumatic rim or wheel center member and, if the non-pneumatic tire is integral with the non-pneumatic rim or wheel center member, any parting within the non-pneumatic rim, or wheel center member.
Load rating means the maximum load a tire is rated to carry.
Maximum tire width means the greater of either the linear distance between the exterior edges of the carcass or the linear distance between the exterior edges of the tread, both being measured parallel to the rolling axis of the tire.
Non-pneumatic rim means a mechanical device which, when a non-pneumatic tire assembly incorporates a wheel, supports the tire, and attaches, either integrally or separably, to the wheel center member and upon which the tire is attached.
Non-pneumatic test rim means with reference to a tire to be tested, any non-pneumatic rim that is listed as appropriate for use with that tire in accordance with S4.4.
Non-pneumatic tire means a mechanical device which transmits, either directly or through a wheel or wheel center member, the vertical load and tractive forces from the roadway to the vehicle, generates the tractive forces that provide the directional control of the vehicle and does not rely on the containment of any gas or fluid for providing those functions.
Non-pneumatic tire assembly means a non-pneumatic tire, alone or in combination with a wheel or wheel center member, which can be mounted on a vehicle.
Non-pneumatic tire identification code means an alphanumeric code that is assigned by the manufacturer to identify the tire with regard to its size, application to a specific non-pneumatic rim or wheel center member or application to a specific vehicle.
Test wheel center member means with reference to a tire to be tested, any wheel center member that is listed as appropriate for use with that tire in accordance with S4.4.
Tread means that portion of the tire that comes in contact with the road.
Tread separation means pulling away of the tread from the carcass.
Wheel means a mechanical device which consists of a non-pneumatic rim and wheel center member and which, in the case of a non-pneumatic tire assembly incorporating a wheel, provides the connection between the tire and the vehicle.
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 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 the tire and the vehicle.
Load rating | Minimum energy level |
Below 880 pounds | 1950 inch pounds. |
880 pounds and above | 2600 inch pounds. |
The Tire and Rim Association
The European Tyre and Rim Technical Organization
Japan Automobile Tire Manufacturers' Association, Inc.
Deutche Industrie Norm
British Standards Institute
Scandinavian Tire and Rim Organization
Tyre and Rim Association of Australia
B = A-1 inch
B = A-2 inches
B = A-3 inches
B = A-4 inches
B = A-5 inches, and
B = A-6 inches.
However, if at any time during the conduct of the test, the test block comes in contact with the non-pneumatic test rim or test wheel center member, the test shall be suspended and no further testing at smaller values of the distance B shall be conducted. When tested to the above procedure, satisfying the requirements of S4.2.2.3 for all values of B greater than that for which contact between the non-pneumatic test rim or test wheel center member and the test block is made, shall constitute compliance to the requirements set forth in S4.2.2.3.
where
E = Energy level, inch-pounds;
F = Force, pounds; and
P = Penetration, inches
Percent
4 hours 85
86 hours 90
24 hours 100
49 C.F.R. §571.129