requirements of paragraph 3.4. above.
6.1.2.2. However, for types of tyres for which the size designation is shown in the first column
of the tables in annex 5 to this Regulation, the outer diameter shall be allowed to be that
given opposite the tyre designation in the tables.
6.1.3. Method of measuring pneumatic tyres
The dimensions of pneumatic tyres shall be measured by the procedure described in
annex 6 to this Regulation.
6.1.4. Tyre section-width specifications
6.1.4.1. The overall width of a tyre may be less than the section width S determined pursuant to
paragraph 6.1.1. above.
6.1.4.2. It may exceed that value up to the value shown in annex 5 or for sizes not included in
annex 5 by the following percentages:
6.1.4.2.1. For normal and snow service:
- rim diameter code 13 and above: + 10%
- rim diameter codes up to 12 inclusive: 8%
6.1.4.2.2. For special service tyres which are suitable for limited road use and are marked MST:
25%.
6.1.5. Tyre outer-diameter specifications
6.1.5.1. The outer diameter of a tyre must not be outside the values Dmin and Dmax specified in
annex 5.
6.1.5.2. For sizes not listed in annex 5 the outer diameter of a tyre must not be outside the values
Dmin and Dmax obtained from the following formulae: Dmin = d + (2H x a)
Dmax = d + (2H x b)
where:
H and d are as defined in paragraph 6.1.2.1. and a and b are as specified in paragraphs
6.1.5.2.1. and 6.1.5.2.2. respectively.
6.1.5.2.1. For normal highway service tyres and snow tyres a
rim diameter code 13 and above 0.97
rim diameter codes up to 12 inclusive 0.93
for special service tyres 1.00
6.1.5.2.2. For normal highway service tyres b
rim diameter code 13 and above 1.07
rim diameter codes up to 12 inclusive 1.10
for snow tyres and special service tyres 1.12
6.2. Load/speed performance test
6.2.1. The pneumatic tyre shall undergo a load/speed performance test carried out by the
procedure described in annex 7 to this Regulation.
6.2.1.1. Where application is made for tyres identified by means of letter code "V" within the
size designation and suitable for speeds over 240km/h or for tyres identified by means