This SAE Recommended Practice describes a test method for determining the vertical force and deflection properties of a non-rolling tire and the associated contact patch length and width. The method applies to any tire so long as the equipment is properly scaled to conduct the measurements for the intended test tire. The data are suitable for use in determining parameters for road load models and for comparative evaluations of the measured properties in research and development. NOTE: Herein@ road load models are models for predicting forces applied to the vehicle spindles during operation over irregular pavements. Within the context of this Recommended Practice@ forces applied to the pavement are not considered. Procedures Two procedures are specified. The first procedure produces tire normal force/deflection data. The second procedure produces gross footprint@ tire contact area@ dimensions. Properly applied@ the second procedure can simultaneously produce both normal force/deflection data and gross footprint dimensions. Test Machines This document is test machine neutral. It may be applied using any type of test machine capable of fulfilling the requirements stated in this document. The test machine must be capable of accommodating the tire sizes which are to be tested.
SAE J2704-2017 history
2018SAE J2704-2018 Tire Normal Force/Deflection and Gross Footprint Dimension Test
2017SAE J2704-2017 Tire Normal Force/Deflection and Gross Footprint Dimension Test
2010SAE J2704-2010 Tire Normal Force/Deflection and Gross Footprint Dimension Test
2005SAE J2704-2005 Tire Normal Force/Deflection and Gross Footprint Dimension Test