# Regulation (EC) No 661/2009 of the European Parliament and of the Council of 13 July 2009 concerning type-approval requirements for the general safety of motor vehicles, their trailers and systems, components and separate technical units intended therefor (Text with EEA relevance), Division 1.1

Extent: E+W+S+N.I.

Class C1 tyres, with reference to the nominal section width of the tyre that has been tested:
Tyre class
Nominal section width (mm)
Limit values in dB(A)
C1A
≤ 185
70
C1B
> 185 ≤ 215
71
C1C
> 215 ≤ 245
71
C1D
> 245 ≤ 275
72
C1E
> 275
74
For snow tyres, extra load tyres or reinforced tyres, or any combination of these classifications, the above limits shall be increased by 1 dB(A).

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Source: https://www.legislation.gov.uk/eur/2009/661/annex/II/part/C/division/1/division/1.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-661/annex-II/part-C/division-1/division-1.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.