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.

Rationale

J2704 has been reaffirmed to comply with the SAE 5-Year Review policy.

Customers who purchased SAE J2704
also purchased

• SAE J1106 : Laboratory Testing Machines for Measuring the Steady State Force and Moment Properties of Passenger Car Tires, Recommended Practice
• SAE J1107 : Laboratory Testing Machines for Measuring the Steady State Force and Moment Properties of Passenger Car Tires, Information Report
• SAE J1269 : Rolling Resistance Measurement Procedure for Passenger Car, Light Truck, and Highway Truck and Bus Tires
• SAE J1270 : Measurement of Passenger Car, Light Truck, and Highway Truck and Bus Tire Rolling Resistance

See More Documents