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Significance and Use
5.1 This test method describes a technique for assessing the performance characteristics of tires in a winter environment on snow and ice surfaces. When snow is referred to hereafter, ice is implied as appropriate.
5.2 The measured values quantify the dynamic longitudinal traction properties of tires under driving torque. Dynamic traction properties are obtained on snow surfaces prepared in accordance with the stated test procedures and attempts to quantify the tires' performance when integrated into a vehicle-environmental system. Changing any one of these environmental factors will change the measurements obtained on a subsequent test run.
5.3 This test method addresses longitudinal driving traction properties only on snow and ice surfaces. Refer to Test Methods F1572 for test methods for braking and lateral traction properties on snow or ice, or both.
1.2 This test method utilizes a dedicated, instrumented, four-wheel rear-wheel drive test vehicle with a specially instrumented drive axle to measure fore-aft and vertical forces acting on a single driven test tire.
1.3 This test method is suitable for research and development purposes where tires are compared during a single series of tests. They may not be suitable for regulatory statutes or specification acceptance because the values obtained may not necessarily agree or correlate either in rank order or absolute traction performance level with those obtained under other environmental conditions on other surfaces or the same surface after additional use.
1.4 The values stated in SI units are to be regarded as the standard. Ordinarily, N and kN should be used as units of force. This standard may utilize kgf as a unit of force in order to accommodate the use of load and pressure tables, as found in other standards both domestic and global that are commonly used with this standard. The values given in parentheses are for information only.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
E1136 Specification for P195/75R14 Radial Standard Reference Test Tire
F377 Practice for Calibration of Braking/Tractive Measuring Devices for Testing Tires
F538 Terminology Relating to the Characteristics and Performance of Tires
F1046 Guide for Preparing Artificially Worn Passenger and Light Truck Tires for Testing
F1572 Test Methods for Tire Performance Testing on Snow and Ice Surfaces
F1650 Practice for Evaluating Tire Traction Performance Data Under Varying Test Conditions
ICS Number Code 83.160.10 (Road vehicle tyres)
UNSPSC Code 25172500(Tires and tire tubes)