# Commission Regulation (EU) No 1230/2012 of 12 December 2012 implementing Regulation (EC) No 661/2009 of the European Parliament and of the Council with regard to type-approval requirements for masses and dimensions of motor vehicles and their trailers and amending Directive 2007/46/EC of the European Parliament and of the Council (Text with EEA relevance), Division 3.1.2: The frequency of oscillation (‘F’ in Hz) of the sprung mass shall be given by the following equation:

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

F = 1 2π K M − C 2 4M 2

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Source: https://www.legislation.gov.uk/eur/2012/1230/annex/III/division/3/division/3.1/division/3.1.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-1230/annex-III/division-3/division-3.1/division-3.1.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.