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ISO 19940:2017

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Current

The latest, up-to-date edition.

Tyre stiffness index testing procedure for passenger car extended mobility and run flat tyres

Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English, French

Published date

11-22-2017

ISO 19940:2017 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 80 km/h (50 mph) and a distance of 80 km when operating in flat tyre running mode, as per ISO 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.

DevelopmentNote
Supersedes ISO/DIS 19940. (11/2017)
DocumentType
Standard
Pages
13
PublisherName
International Organization for Standardization
Status
Current

Standards Relationship
BS ISO 19940:2017 Identical

ISO 4000-1:2015 Passenger car tyres and rims Part 1: Tyres (metric series)
ISO 4000-2:2013 Passenger car tyres and rims Part 2: Rims
ISO 16992:2010 Passenger car tyres Spare unit substitutive equipment (SUSE)

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