Noise emission ratings
One of the key elements shown on a tyre's label is a noise emission rating based on the performance a tyre will achieve in this area. Noise emission ratings are explained below.
What are noise emissions?
Noise emissions are the amount of noise made by a tyre when it rolls along the road surface and are recorded as part of the tyre label.
The tyre’s exterior noise is expressed in decibels (dB) and is depicted by a series of black waves.
Three black waves indicate that the tyre produces the most amount of noise on the scale, while one black wave symbolises the quietest.
In fact, three waves is the current limit, while two meets future laws and one is a further 3dBs below the statutory requirement.
1 wave - low noise tyre
2 waves - average noise tyre
3 waves - noisier tyre
How is it calculated?
The tyre label noise emission rating is based on an ISO pass-by noise test, whereby noise is measured as a car travelling at 50mph passes by two microphones that are positioned 7.5m from the centre line at a height of 1.2mh.
Why are noise emission ratings important?
The noise a tyre makes might not seem a crucial buying factor, but for motorists spending a large amount of time driving on motorways it may be an important factor which contributes to driving comfort. It's also relevant if you drive a convertible car with the roof down. Until the launch of tyre labelling it was not possible to know the noise level of a tyre until it had been fitted and driven on.
If you would like any advice on choosing the right tyre for your requirements call our National Sales Team on 0800 028 9000. Alternatively, you can order tyres online by entering your tyre size into the search tool at the top of the page.