| Useful information regarding tyre noise |
| Tyre noise is determined primarily by the tyres and the road surface. |
| As regards the road surface, it is the roughness, structure and material which influence tyre noise. |
| As regards the tyres, the width of the tyre and rim has an influence on tyre noise. Due to their larger contact area, wider tyres will cause more tyre noise than narrow tyres, as more air has to be displaced and more mass is agitated to create vibrations. |
| A wider wheel rim will also cause a tyre to have a wider contact area. The effect on tyre noise is thus very similar to that of a wider tyre. Moreover, the damping characteristics of the tyre may also be adversely affected by the wider wheel rim. |
| On vehicles with a front-mounted engine, tyre noise is more perceptible at the rear of the vehicle, as wind and engine noises are not as loud there. |
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| Tyres which comply with EU Regulation ECE - R117 (new road noise limits for tyres) also carry the marking „S“ (for Sound) on the sidewall. |
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| For passenger car tyres with a cross sectional width of up to 185 mm: from 1 October 2009 onwards |
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| For passenger car tyres with a cross sectional width of between 185 mm and 215 mm: from 1 October 2010 onwards |
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| For passenger car tyres with a cross sectional width of over 215 mm: from 1 October 2011 onwards |
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