SZNS SANS 1550-1: 2017 Motor Vehicle Tyres and Rims- Dimensions and Loads Part 1- General

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Description

1.1 This part of SANS 1550 specifies the general requirements for motor vehicle pneumatic tyres, giving the basic definitions, details of the parameters used for tyre marking requirements and a test method for the measurement of tyre dimensions.

1.2 It does not cover motorcar racing or motorcycle racing applications.

NOTE Data for specific tyre and rim sizes (with some exceptions) is not given in this part of SANS 1550. Such data is available from the standards manuals (see clause 2) referred to in this part of SANS 1550 or from the appropriate tyre manufacturers.

Contents                                                                                                                             Page

1 Scope…………………………………………………………………………………………………………………………………………..  1

2 Normative references……………………………………………………………………………………………………………….. 1

3 Definitions…………………………………………………………………………………………………………………………………….1

4 General Requirements…………………………………………………………………………………………………………….3

4.1 Tyre size designation ……………………………………………………………………………………………………………..3

4.2 Nominal section …………………………………………………………………………………………………………………….4

4.3 Nominal rim diameter ……………………………………………………………….….……….…………………….4

4.4 Nominal aspect ratio……………………..…….………………….……………….……………………………………5

4.5 Speed rating symbol markings…… …………………………………………….…………………………………5

4.6 Load index number…………………………………….………… …………………………….…………………………5

4.7 Regrooving……………….……………………….………………………………..…………….……………………………5

5 Inspection and Test  ……..………………………………………………………………………………………………….6

5.1 Visual inspection …………………………………..……………………………………………………………………….8

5.2 Measuring the section width and overall diameter ………………………………………..……………9