{
  "url": "https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/4/division/division-6./division-6.6./division-6.6.3.",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/4/division/division-6./division-6.6./division-6.6.3..json",
  "legislation": "eur/2017/1151",
  "legislation_title": "Commission Regulation (EU) 2017/1151 of 1 June 2017 supplementing Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information, amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) No 1230/2012 and repealing Commission Regulation (EC) No 692/2008 (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2017-1151",
  "path": "annex/Sub/4/division/division/6./division/6.6./division/6.6.3.",
  "kind": "division",
  "number": "6.6.3",
  "heading": "Correcting measured chassis dynamometer forces to those on a flat surface",
  "text": "The measured forces on the chassis dynamometer shall be corrected to a reference equivalent to the road (flat surface) and the result shall be referred to as fj.\nfj=fjDyno×c1×1RWheelRDyno×c2+1+fjDyno×1−c1\nwhere:\nc1is the tyre rolling resistance fraction of fjDyno;\nc2is a chassis dynamometer-specific radius correction factor;\nfjDynois the force calculated in paragraph 6.5.2.3.3. for each reference speed j, N;\nRWheelis one-half of the nominal design tyre diameter, m;\nRDynois the radius of the chassis dynamometer roller, m.\nThe manufacturer and the approval authority shall agree on the factors c1 and c2 to be used, based on correlation test evidence provided by the manufacturer for the range of tyre characteristics intended to be tested on the chassis dynamometer.\nAs an alternative the following conservative equation may be used:\nfj=fjDyno×1RWheelRDyno×0,2+1\nC2 shall be 0,2 except that 2,0 shall be used if the road load delta method (see paragraph 6.8.) is used and the road load delta calculated in accordance with paragraph 6.8.1. is negative.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Substituted by Commission Regulation (EU) 2018/1832 of 5 November 2018 amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) 2017/1151 for the purpose of improving the emission type approval tests and procedures for light passenger and commercial vehicles, including those for in-service conformity and real-driving emissions and introducing devices for monitoring the consumption of fuel and electric energy (Text with EEA relevance)."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/4/division/division/6./division/6.6./division/6.6.3.",
    "retrieved_at": "2026-11-01T14:44:48.753743+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}