ASTM F2663-21a

Standard Test Method for Bead Unseating of Tubeless Passenger and Light Truck Tires

SIGNIFICANCE AND USE
5.1 This test method establishes a standard procedure for the test and provides data that can be related to the force required to unseat the bead of a tire inflated with a specified pressure from the rim. This test method does not establish performance limits or tolerances for tire specifications.
SCOPE
1.1 This test method covers the static non-rolling laboratory method of determination of a tubeless tire’s resistance to bead unseating. The test requires the use of a standardized fixture and load machine. The test is conducted using a defined test pressure and method of determining the resultant force to unseat the tire from the rim.  
1.2 This test method is applicable for all passenger, light truck, and temporary spare tires.  
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.  
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 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.

General Information

• Status: Published
• Publication Date: 31-Aug-2021
• ICS: 83.160.10 - Road vehicle tyres
• Technical Committee: F09 - Tires
• Drafting Committee: F09.30 - Laboratory (Non-Vehicular) Testing

Standards Content (Sample)

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.
Designation: F2663 − 21a
Standard Test Method for
Bead Unseating of Tubeless Passenger and Light Truck
1
Tires
This standard is issued under the fixed designation F2663; 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.
1. Scope 3. Terminology
3.1 Definitions:
1.1 This test method covers the static non-rolling laboratory
method of determination of a tubeless tire’s resistance to bead 3.1.1 bead, of a tire, n—part of a tire that comes in contact
with the rim and is shaped to secure the tire to the rim. F538
unseating. The test requires the use of a standardized fixture
and load machine. The test is conducted using a defined test
3.1.2 bead unseating block, n—machined block of cast
pressure and method of determining the resultant force to
aluminum (also known as “shoe”) used on the bead unseating
unseat the tire from the rim.
fixture to press against the tire sidewall. F538
1.2 This test method is applicable for all passenger, light
3.1.3 manufacturer, n—of a tire, the name of a company or
truck, and temporary spare tires.
wholly owned subsidiary making the tire. F538
1.3 The values stated in SI units are to be regarded as 3.1.4 measuring rim, n—any ‘rim’with a width as specified
standard. The values given in parentheses are for information
for the design or measuring rim for a particular tire size
only. designation, and with the ‘bead’seat and flange dimensions in
accordance with publications of tire and rim standards organi-
1.4 This standard does not purport to address all of the
zations current at the time of manufacture. F538
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.1.5 outside diameter, n—the maximum diameter of a tire
priate safety, health, and environmental practices and deter- when it is mounted and inflated. F538
mine the applicability of regulatory limitations prior to use.
3.1.6 overall width, n—the maximum cross-sectional width
1.5 This international standard was developed in accor-
of a tire, including protective or decorative ribs. F538
dance with internationally recognized principles on standard-
3.1.7 rim, n—the specially shaped circular periphery to
ization established in the Decision on Principles for the
which a tire may be mounted with appropriate bead fitment.
Development of International Standards, Guides and Recom-
F538
mendations issued by the World Trade Organization Technical
3.1.8 rim, test, n—a rim having the configuration and
Barriers to Trade (TBT) Committee.
dimensions suitable for use with a test tire in accordance with
publications of a tire and rim standards organization current at
2. Referenced Documents
the time of tire manufacture. F538
2
2.1 ASTM Standards:
3.1.9 sidewall, of a tire, n—thatportionofatirebetweenthe
F538 Terminology Relating to Characteristics and Perfor-
tread and the bead. F538
mance of Tires
F1502 Test Method for Static Measurements on Tires for
3.1.10 specified design section width, n—thewidthspecified
Passenger Cars, Light Trucks, and Medium Duty Vehicles
in the publications of tire and rim standards organizations
current at the time of manufacture for a new tire of that size
designation and type when inflated on its “measuring rim.”
F538
1
This test method is under the jurisdiction of ASTM Committee F09 on Tires
and is the direct responsibility of Subcommittee F09.30 on Laboratory (Non-
3.1.11 tire, light truck, n—a tire of a group prescribed in
Vehicular) Testing.
“Light Truck” or “Commercial” tire sections of industry
Current edition approved Sept. 1, 2021. Published February 2022. Originally
standards manuals such as The European Tyre and Rim
approved in 2007. Last previous edition approved in 2021 as F2663 – 21. DOI:
10.1520/F2663-21A.
Technical Organisation (ETRTO), Japan Automobile Tyre
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Manufacturers Association (JATMA), and The Tire and Rim
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Association (TRA). The tire will typically have either “LT” or
Standardsvolume information, refer to the standard’s Document Summary page on
the ASTM website. “C” (C-type) as part of the tire size designation.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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F2663 − 21a
3.1.11.1 Discussion—An LTtire is a
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
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: F2663 − 21 F2663 − 21a
Standard Test Method for
Bead Unseating of Tubeless Passenger and Light Truck
1
Tires
This standard is issued under the fixed designation F2663; 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.
1. Scope
1.1 This test method covers the static non-rolling laboratory method of determination of a tubeless tire’s resistance to bead
unseating. The test requires the use of a standardized fixture and load machine. The test is conducted using a defined test pressure
and method of determining the resultant force to unseat the tire from the rim.
1.2 This test method is applicable for all passenger, light truck, and temporary spare tires.
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.4 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 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
2.1 ASTM Standards:
F538 Terminology Relating to Characteristics and Performance of Tires
F1502 Test Method for Static Measurements on Tires for Passenger Cars, Light Trucks, and Medium Duty Vehicles
3. Terminology
3.1 Definitions:
3.1.1 bead, of a tire, n—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 bead unseating block, n—machined block of cast aluminum (also known as “shoe”) used on the bead unseating fixture to
press against the tire sidewall. F538
3.1.3 manufacturer, n—of a tire, the name of a company or wholly owned subsidiary making the tire. F538
1
This test method is under the jurisdiction of ASTM Committee F09 on Tires and is the direct responsibility of Subcommittee F09.30 on Laboratory (Non-Vehicular)
Testing.
Current edition approved April 1, 2021Sept. 1, 2021. Published May 2021February 2022. Originally approved in 2007. Last previous edition approved in 20152021 as
F2663 – 15.F2663 – 21. DOI: 10.1520/F2663-21.10.1520/F2663-21A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standardsvolume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
F2663 − 21a
3.1.4 measuring rim, n—any ‘rim’ with a width as specified for the design or measuring rim for a particular tire size designation,
and with the ‘bead’ seat and flange dimensions in accordance with publications of tire and rim standards organizations current at
the time of manufacture. F538
3.1.5 outside diameter, n—the maximum diameter of a tire when it is mounted and inflated. F538
3.1.6 overall width, n—the maximum cross-sectional width of a tire, including protective or decorative ribs. F538
3.1.7 rim, n—the specially shaped circular periphery to which a tire may be mounted with appropriate bead fitment. F538
3.1.8 rim, test, n—a rim having the configuration and dimensions suitable for use with a test tire in accordance with publications
of a tire and rim standards organization current at the time of tire manufacture. F538
3.1.9 sidewall, of a tire, n—that portion of a tire between the tread and the bead. F538
3.1.10 specified design section width, n—the width specified in the publications of tire and rim standards organizations current at
the time of manufacture for a new tire of that size designation and type when inflated on its “measuring rim.” F538
3.1.11 tire, light truck, n—a tire of a group prescribed in “Light Truck” or “Commercial” tire sections of industry standards
manuals such as The European Tyre and Rim Technical Organisation (ETRTO), Japan Automobile Tyre Manufacturers Associati
...