SAE J2673_202103

This SAE Recommended Practice (RP) describes a test method for determination of heavy truck (Class VI, VII, and VIII) tire force and moment properties under straight-line braking conditions. The properties are acquired as functions of normal force and slip ratio using a sequence specified in this practice. At each normal force increment, the slip ratio is continually changed by application of a braking torque ramp. The data are suitable for use in vehicle dynamics modeling, comparative evaluations for research and development purposes, and manufacturing quality control. This document is intended to be a general guideline for testing on an ideal machine. Users of this RP may modify the recommended protocols to satify the needs of specific use-cases; e.g., reducing the recommended number of test loads and/or pressures for benchmarking purposes. However, due care is necessary when modifying the protocols to maintain data integrity. The purpose of this revision is to correct minor errors in the existing document and to bring the document up to date in light of developments between 2010 and 2020. The original document referenced an over-the-road test machine that has since been decommissioned and is no longer available. The document has also been updated to include new classes of hybrid testing machines, one of which tests a tire while moving it over a paved surface in a controlled environment.