ASTM F3678-23

Overview

ASTM F3678-23: Standard Specification for 245/70R19.5 136/134M Radial Truck Standard Reference Test Tire SW is an internationally recognized standard developed by ASTM International. This specification outlines the requirements for a specific radial truck tire primarily intended as a standard reference test tire (SRTT) for evaluating braking traction and snow traction of commercial vehicles. The 245/70R19.5 136/134M radial truck SRTT serves as a consistent benchmark in regulatory and test environments, supporting the comparability and repeatability of results across different tire testing applications.

Key Topics

• Reference Tire Purpose: This standard test tire is used as a control when conducting braking traction and snow traction tests to ensure data consistency.
• Standard Design and Construction: The specification details requirements relating to the 19.5-inch rim diameter, tread design, tread compound properties, and physical dimensions.
• Dimensional and Manufacturing Control: Manufacturers must ensure dimensional accuracy and minimize variability between tires. Specific parameters for tread width, section width, outside diameter, and construction are defined.
• Testing and Quality Control: Standardized test methods for durometer hardness, dissipation factor, and shear modulus are referenced to validate tread compound quality.
• Storage Conditions: Prescribed environmental conditions for the storage of the reference test tire maintain product integrity and consistency.
• Compliance with International Principles: The standard aligns with World Trade Organization Technical Barriers to Trade (TBT) Committee requirements, enhancing its global relevance.

Applications

• Braking and Traction Testing: The 245/70R19.5 reference tire is a critical component in laboratory and field testing of commercial vehicle tires for braking and snow traction performance. Its use helps minimize variability in test methods.
• Regulatory Compliance: Authorities and organizations worldwide rely on this standard reference tire to assess compliance with international regulations related to wet grip and snow traction for Class C2 and C3 commercial vehicle tires.
• R&D and Benchmarking: Tire manufacturers and testing organizations use this SRTT to compare new tire designs, ensuring reliable and repeatable benchmark test results.
• Quality Assurance: The tire’s controlled design and manufacturing processes enable quality assurance in test programs that demand high consistency among sample tires.

Related Standards

The ASTM F3678-23 specification references and complements several other ASTM standards that cover both tire reference testing and characterization. These include:

• ASTM E867: Terminology Relating to Vehicle-Pavement Systems
• ASTM F538: Terminology Relating to Characteristics and Performance of Tires
• ASTM E1136: Specification for P195/75R14 Radial Standard Reference Test Tire
• ASTM F2493: Specification for P225/60R16 97S Radial Standard Reference Test Tire
• ASTM F2870: Specification for 315/70R22.5 154/150L Radial Truck Standard Reference Test Tire
• ASTM F2871: Specification for 245/70R19.5 136/134M Radial Truck Standard Reference Test Tire
• ASTM F2872: Specification for 225/75R16C 116/114S M+S Radial Light Truck Standard Reference Test Tire
• ASTM F3611: Specification for P225/60R16 97S Radial Low Tread Depth Standard Reference Test Tire
• ASTM F3675, F3676, F3677: Additional reference standards for radial test tires in various sizes

Practical Value

The use of the 245/70R19.5 136/134M SRTT within ASTM F3678-23 provides a uniform basis for testing and evaluating truck and commercial vehicle tires under controlled conditions. By standardizing baseline properties, dimensions, and storage, this specification ensures results are repeatable and comparable, supporting tire manufacturers, regulatory bodies, and safety organizations in their quality and compliance activities.

Keywords: ASTM F3678-23, standard reference test tire, SRTT, 245/70R19.5, truck tire testing, braking traction, snow traction, tire specification, commercial vehicle tire, tire standards.