ASTM F1426 - 20

    Standard Practice for Identifying Tire Tread Surface Irregular Wear Patterns Resulting from Tire Use

    Active Standard ASTM F1426 | Developed by Subcommittee: F09.94

    Book of Standards Volume: 09.02


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    Significance and Use

    3.1 This practice fulfills the need for a standardized system for identifying and describing the tread pattern features of tires that are characteristic of intermediate states of treadwear short of total wear out. This descriptive capability is especially important in testing programs devoted to the development of improved performance tires. It is also important in assessing and evaluating tires after periods of typical tire usage.

    1. Scope

    1.1 This practice provides the instructions and nomenclature to evaluate the wear features of the tread pattern on a tire for some intermediate state prior to wear out.

    1.2 A tire may be characterized by certain worn tread pattern conditions that are collectively referred to as “irregular wear” features. Definitions for these features are given in a special logical and conceptual sequence. First, basic tread pattern definitions are given. Then, additional tread pattern definitions directly related to the basic tread pattern definitions are given. Understanding these secondary definitions requires the knowledge of the basic definitions.

    1.3 Based on the terms of this developed system of tread pattern definitions or descriptions, a set of treadwear descriptions is presented that encompasses both regular wear and irregular wear features.

    1.4 This hierarchical arrangement produces the accurate and concise definitions needed to evaluate the complex irregular wear conditions of tires.

    1.5 See Fig. 1 for tread pattern features or characteristics. See Fig. 2 and Fig. 3 for typical illustrations of regular or uniform and irregular treadwear features.

    FIG. 1 Tread Pattern Characteristics

    Tread Pattern CharacteristicsTread Pattern Characteristics

    FIG. 2 Uniform or Regular Wear

    Uniform or Regular WearUniform or Regular Wear

    FIG. 3 Types of Irregular Wear

    Types of Irregular WearTypes of Irregular Wear

    FIG. 3 Types of Irregular Wear (continued)

    Types of Irregular WearTypes of Irregular Wear

    FIG. 3 Types of Irregular Wear (continued)

    Types of Irregular WearTypes of Irregular Wear

    FIG. 3 Types of Irregular Wear (continued)

    Types of Irregular WearTypes of Irregular Wear

    FIG. 3 Types of Irregular Wear (continued)

    Types of Irregular WearTypes of Irregular Wear

    Note 1: Images courtesy of The Technology & Maintenance Council of the American Trucking Associations, reference Radial Tire Conditions Analysis Guide, Item # T0121. For more information, contact TMC: (703) 838-1763; tmc@trucking.org; http://tmc.trucking.org.

    Note 2: Images courtesy of the Tire Industry Association, reference Passenger and Light Truck Tire Conditions Manual, www.tireindustry.org.

    Note 3: In illustrations (h), (l), and (m), the ‘light’ or ‘featureless’ areas indicate high wear rate zones.

    Note 4: Images courtesy of the U.S. Tire Manufacturers Association, reference Care and Service of Passenger and Light Truck Tires Manual, www.ustires.org.

    1.6 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    F538 Terminology Relating to the Characteristics and Performance of Tires


    ICS Code

    ICS Number Code 83.160.10 (Road vehicle tyres)

    UNSPSC Code

    UNSPSC Code 25172500(Tires and tire tubes)


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/F1426-20

    Citation Format

    ASTM F1426-20, Standard Practice for Identifying Tire Tread Surface Irregular Wear Patterns Resulting from Tire Use, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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