Tyre stiffness index testing procedure for passenger car extended mobility and run flat tyres
This document specifies the testing method for determining the tyre stiffness index of passenger car tyres for the products capable of supplying the vehicle with the basic tyre functions, at least, at a speed of 80Â km/h (50Â mph) and a distance of 80Â km when operating in flat tyre running mode, as per ISOÂ 16992.
This method is meant to determine the above mentioned index, for the characterization of the expected tyre’s stiffness through its air and structural components.
To reach the target, the vertical force and the vertical deflection, in the sense of absolute position in Z direction under different operating conditions, are measured (approximated in case of zero inflation pressure) and combined through the metrics defined in this document.
This method is not intended to be used for conventional tyres.
| SDO | BSI: British Standards Institution |
| Document Number | ISO 19940 |
| Publication Date | May 16, 2018 |
| Language | en - English |
| Page Count | |
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| Supercedes | |
| Committee | AUE/4 |
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