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Stepwise Coastdown Methodology for Measuring Tire Rolling Resistance
- Ground Vehicle Standard
Published July 26, 2017 by SAE International in United States
Downloadable datasets availableAnnotation ability available
This SAE Recommended Practice is applicable to pneumatic Passenger Car “P” Type, Light Truck Metric, and Light Truck High Flotation tires, or similar tires approved by bodies other than Tire & Rim Association. The methodology is applicable within normal operating ranges of vertical load and inflation pressure, and for velocities between 115 km/h and 15 km/h (71 mph and 9 mph) during a relatively short duration event such as a coastdown. This procedure is applicable only to operation in the free-rolling mode at zero slip and camber angle for ambient temperatures between 20 °C and 28 °C (68 °F and 82 °F) and for surfaces with diameters of 1.2 m (48 in) diameter or greater. Details regarding the equipment, tires, and test methods used specifically for validation of this document are included in Appendix A. Two basic measurement methods covered by this document are as follows:
The revisions in this version are to address missing SI units a typo in section 3.10 and to clarify issues associated with zero speed points in the MERF/SMERF calculations.
|Ground Vehicle Standard||Rolling Resistance Measurement Procedure for Passenger Car, Light Truck, and Highway Truck and Bus Tires|
|Ground Vehicle Standard||Measurement of Passenger Car, Light Truck, and Highway Truck and Bus Tire Rolling Resistance|
Data Sets - Support Documents
|Unnamed Dataset 1|
|Unnamed Dataset 2|
|Unnamed Dataset 3|
|TABLE 1||BASE INFLATION PRESSURE - “P” TYPE|
|TABLE 2||CONVERSION FACTORS|
|TABLE 3||LOAD AND INFLATION TEST MATRICES|
|TABLE 4||GAGE R AND R RESULTS SUMMARY|
|TABLE A1||PASSENGER CAR VERIFICATION TEST MATRIX|
|TABLE A2||LIGHT TRUCK VERIFICATION TEST MATRIX|
|TABLE C1||TEST SEQUENCE|
|TABLE C2||TEST CONDITIONS|
|TABLE C3||TEST TIRES|
To plan and execute a cooperative tire test development program, to evaluate the fatigue endurance performance of light duty highway tires. Activities will include empirical comparisons of tire performance on the various, proposed tests, together with evaluating reasonable relationships to tire usage and durability performance on the highway.
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