Division 7.1.1.1 The section width shall be calculated by the following formula:F1
S = S 1 + K (A — A 1 )
where:
S: is the actual section width in millimetres as measured on the test rim;
S 1 : is the value of the ‘Design Section Width’, referred to the measuring rim, as quoted in the International Tyre Standard specified by the retreader for the tyre size in question;
A: is the width of the test rim in millimetres;
A 1 : is the width in millimetres of the measuring rim as quoted in the International Tyre Standard specified by the retreader for the tyre size in question.
K: is a factor and shall be taken to equal 0,4.