Resistance movement

The European Directive 2001/43/EC, which sets standards for tyre noise, confirmed the European Parliament's intention to extend European tyre legislation to include safety, environmental and rolling-resistance aspects. However, the standard on measuring tyre rolling resistance, ISO 18164, is too loose to be used for meaningful comparisons. The European Tyre and Rim Technical Organisation (ETRTO) has developed a revised procedure that has been tested by five tyre-makers. Measurements were within plus or minus 2%. In the UK, the Department for Transport commissioned Mira and Rapra Technology to conduct research on truck tyre rolling resistance. Tests involved 120 truck tyres of different sizes and tread patterns. The results suggested that rolling resistance claims could not be taken at face value, with differences between equivalent tyres. Michelin research cited rolling resistance differences of 55% between the best and worst truck and bus drive-axle tyres. Tyre manufacturers are emphasising the fuel savings that can be made with low-rolling-resistance tyres. The Mira/Rapra tests showed that tyre diameter is a major factor in rolling resistance and that steer-axle tyres have a lower rolling resistance than drive-axle tyres of the same size. Retreaded tyres generally have a greater rolling resistance than equivalent new tyres.(A)

Language

  • English

Media Info

  • Pagination: 20-23
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01043741
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Mar 9 2007 8:14AM