ASTM F2663-21a PDF

Full title and description

Standard Test Method for Bead Unseating of Tubeless Passenger and Light Truck Tires — designation ASTM F2663-21a. This test method defines a static, non‑rolling laboratory procedure and required apparatus to determine the force required to unseat the bead of a tubeless tire from a rim under a specified inflation pressure.

Abstract

ASTM F2663-21a specifies a standardized fixture, bead unseating block (shoe), measuring rim definitions, test pressures and load‑machine procedure for measuring a tubeless passenger or light‑truck tire’s resistance to bead unseating. The method produces repeatable data for comparison and product development but does not establish pass/fail performance limits for tires. The procedure is intended for laboratory evaluation of passenger, light truck and temporary spare tires.

General information

• Status: Active / Published
• Publication date: 1 September 2021 (designation F2663-21a)
• Publisher: ASTM International
• ICS / categories: 83.160.10 — Road vehicle tyres
• Edition / version: F2663-21a (2021)
• Number of pages: 11

Details above are taken from the ASTM document summary and standard listings.

Scope

This standard covers a static non‑rolling laboratory method to determine a tubeless tire’s resistance to bead unseating. It requires the use of a standardized fixture and load machine, defined test pressures, and measured rim and bead interface geometries. It applies to passenger tires, light truck tires and temporary spare tires. SI units are the standard; values in parentheses are for information only. The method does not itself set performance limits — it provides comparative force data for design, verification and quality control.

Key topics and requirements

• Test principle: static, non‑rolling bead unseating test to measure resultant unseating force.
• Required apparatus: standardized bead‑unseating fixture, machined unseating block (shoe), measuring rim(s), and calibrated load machine.
• Test conditions: specified inflation pressures and use of defined measuring rims for the tire size under test.
• Terminology and definitions: references ASTM terminology for tire characteristics and definitions (e.g., bead, unseating block, measuring rim).
• Procedure details: specimen preparation, mounting, loading rate, measurement of resultant force and reporting.
• Units and reporting: SI units are primary; test results reported to allow comparison but not used by the standard to declare pass/fail limits.

These topics summarize the principal test and reporting requirements in the standard.

Typical use and users

Primary users include tire manufacturers (R&D and verification), independent test laboratories, automotive OEM safety engineers, rim and wheel manufacturers, regulatory bodies and suppliers involved in tire and wheel system design. Typical uses are design verification, comparative evaluation of bead/rim interfaces, quality control, investigation of bead retention performance and supporting product development decisions.

Related standards

Commonly referenced and related documents include ASTM F538 (terminology relating to tire characteristics and performance) and ASTM F1502 (static tire measurement methods). F2663-21a revises earlier editions of F2663 (for example F2663‑21 and F2663‑15) and is maintained under ASTM Committee F09 on Tires (Subcommittee F09.30 laboratory testing).

Keywords

bead unseating; tubeless tire; passenger tire; light truck tire; bead; rim; unseating block; load machine; static test; laboratory method; ASTM F2663-21a.

FAQ

Q: What is this standard?

A: ASTM F2663-21a is a standardized laboratory test method to measure the force required to unseat the bead of a tubeless passenger or light truck tire from a rim under specified conditions.

Q: What does it cover?

A: It covers the static (non‑rolling) test procedure, required fixtures (including the bead unseating block), measuring rim definitions, test pressures, load‑machine requirements, and reporting conventions for measuring bead unseating force. It does not prescribe performance acceptance criteria.

Q: Who typically uses it?

A: Tire manufacturers, independent test labs, OEM engineers, wheel/rim suppliers and regulatory or certification organizations use this method for development, verification and comparative testing.

Q: Is it current or superseded?

A: As published, F2663-21a (dated 2021) is the active edition and it revises earlier editions (including F2663‑21 and F2663‑15). Users should confirm whether a more recent revision has been issued before applying the method.

Q: Is it part of a series?

A: Yes — it is part of the ASTM F2663 series of bead‑unseating test methods and is maintained under ASTM Committee F09 (Tires), Subcommittee F09.30 (Laboratory testing). It also references other ASTM tire standards (for terminology and related measurements).

Q: What are the key keywords?

A: bead unseating; tubeless tires; passenger tires; light truck tires; bead; rim; static test; load machine; unseating block; ASTM F2663-21a.