ASTM F1923-21

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F1923 − 98 (Reapproved 2014) F1923 − 21
Standard Test Method for
Tires, Pneumatic, Low Speed, Off Highway
This standard is issued under the fixed designation F1923; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This ASTM Standard has been developed to replace ASTM Provisional Standard PS 86-97. The
Provisional Standard was approved so that the U.S. military and other government agencies could
continue to purchase tested and qualified tires, until In 1998, the standards used for F1923 had been
approved. The provisional standard replaced the government’s specification ZZ-T-1083, the Federal
Specification, Tires, Pneumatic, Low Speed, Off Highway, under the former Federal Tire Program.
That program was discontinued and is replaced by the U.S. Army Tank Automotive Command’s U.S.
Army’s Cooperative Tire Qualification Program (CTQP). While fulfilling the military’s commercial
and tactical needs, the CTQP will continue (CTQP), which replaced the Federal Tire Program, were
officially approved by ASTM. This ASTM Standard has been developed to serve federal, state, and
local agencies that want to purchase qualified tires using this test method.
This test method is designed to be used in conjunction with the Administrator’s Approval and
Requirements Manual for Tires, Pneumatic, Low Speed, Off Highway (CTQP F1923) (1), to qualify
tires for purchase by the U.S. federal government, military, and other state and local entities.
1. Scope
1.1 This test method covers measurements for comparative tire strength and dimensional characteristics. This test method covers
new and retreaded pneumatic tires, both tube and tubeless types, and flaps when applicable, for mounting on construction,
earthmoving, mining and logging equipment, graders, mobile cranes, and similar vehicles operated at low speeds off the road.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
This test method is under the jurisdiction of ASTM Committee F09 on Tires and is the direct responsibility of Subcommittee F09.20 on Vehicular Testing.
Current edition approved Jan. 1, 2014Sept. 1, 2021. Published February 2014October 2021. Originally approved in 1998. Last previous edition approved in 20052014 as
F1923 – 98 (2005).(2014). DOI: 10.1520/F1923-98R14.10.1520/F1923-21.
The boldface numbers in parentheses refer to the list of references at the end of this standard.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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F1923 − 21
D412 Test Methods for Vulcanized Rubber and Thermoplastic Elastomers—Tension
F538 Terminology Relating to Characteristics and Performance of Tires
3. Terminology
3.1 Definitions:
3.1.1 bead, n—of a tire, the part of a tire that comes in contact with the rim and is shaped to secure the tire to the rim. F538
3.1.2 groove, n—a void that is relatively narrow compared to its length. F538
3.1.3 groove (void) depth, depth [L], n—measurement of the perpendicular distance from a real or calculated reference defined
by edges of two adjacent ribs (lugs) to the lowest point of contact in the groove (void). F538
3.1.4 load index, n—a numerical code associated with the maximum load a tire can carry at the speed indicated by its speed symbol
under specified conditions. F538
3.1.5 load symbol, n—a code associated with the maximum load a tire can carry at the speed indicated by its speed symbol under
specified conditions. F538
2 2
3.1.6 nominal plunger energy, ⁄2 [ML /T ],n—in tire testing, one half of the product of a peak force (required to rupture the tire
F538
structure in the tread area) and maximum plunger travel into a tire at the time of rupture.
3.1.7 outside diameter, n—the maximum diameter of a tire when it is mounted and inflated. F538
3.1.8 overall width, n—the maximum cross-sectional width of a tire, including protective or decorative ribs. F538
3.1.9 ply, n—in a tire, a layer of rubber-coated parallel cords. F538
3.1.10 ply rating, n—the term is used to identify a given tire with its maximum recommended load when used in a specific type
of service, giving an index of tire strength, not necessarily representing the number of cord plies in the tire. F538
3.1.11 rib, n—a continuous circumferential projection. F538
3.1.12 rim, n—the periphery of a wheelspecially shaped circular periphery to which a tire or a tube assembly may be affixed.may
be mounted with appropriate bead fitment. F538
3.1.13 sidewall, n—of a tire, that portion of a tire between the tread and the bead. F538
3.1.14 tire, n—a load-bearing ground-contacting circumferential attachment to a vehicle wheel. F538
3.1.15 tread, n—of a tire, the part of a tire that comes in contact with the ground. F538
3.1.16 tread depth, [L],n—synonym for groove (void) depth. F538
4. Significance and Use
4.1 This test method establishes a standard procedure of comparative testing, for tire strength and dimensional characteristics, for
use under the Administrator’s Cooperative Approved Tire List (CATL) (2).
5. Procedure
5.1 Selection and Preparation of the Test Tires:
5.1.1 Preparation of Tire for Outside Diameter, Tire Width, and Tread Depth Measurements and Tests: The tire shall be mounted
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