Tire force and moment data are fundamental inputs to vehicle handling simulations. Tire asymetries and tire and test variability must be considered in force and moment testing.

This article provides a discussion of asymmetries in tire force and moment behavior and of variation in their data. The asymmetry discussion is thoroughly general. The variability discussion is philosophically general, but the data are specific to the test specifications and tests used. Variability data are presented for the range from −14 to +14 degrees slip angle.

The data and concepts concerning tire asymmetries and test data variability presented are especially important now because work to produce up‐to‐date force and moment testing standards is beginning under the auspices of the Society of Automotive Engineers (SAE).

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