Excessive tyre noise: all possible causes and solutions
Many car owners face such problem as tyre noise. This phenomenon cannot be considered utterly negative, but it creates some discomfort during trips. Low noise level is often considered as one of the main characteristics, when it comes to choosing new tyres. Some people try to cope with it using good acoustics or even a radio, but it does not help in all cases. Moreover, except for the annoying monotonous sound, the car owners worry that the noise can be the sign of malfunction. In fact, the reasons lie in the quality of the road surface and the tyres themselves.
Why are summer tyres nosier than winter tyres?
Mainly, car owners complain about noise after replacing winter tyres with summer tyres. Right after such change, the difference is especially noticeable. And the reason for the high noise level is not the open window, but the following:
- Tread Features. The tread of winter tyres has many grooves and lamellae designed to remove wet snow and increase traction with icy road surface. Summer tyres have a smoother pattern, since ensuring stability on a snowy road is not their task.
- The difference in rubber compound. Winter tyres are made of softer rubber, because it does not “stiff” in frosty weather. It is important for proper grip on snowy roads. Summer tyres should be stiff and stable all the time, therefore they are made from other rubber compound.
The difference of noise level between summer and winter tyres
If we consider summer and winter tyres from the point of view of different noise levels, then the following should be noted:
- Rubber in summer tyres is stiffer. When the tread hits the particles of macadam (pavement filler), great noise arises.
- Rubber in winter tyres is softer than in summer tyres. The tread is cut by many lamellae and grooves, and when they meet the macadam particles, the volume of the noise emitted is much lower than in the case of summer tyres.
- Summer tyres have wider tread blocks. During driving at high speed, there is not enough time for air to be removed, which is why micro-claps appear creating noise.
- Winter tyres have a pronounced tread pattern. Numerous lamellae and grooves easily remove air from under the tyres during driving, preventing appearance of micro-claps and other noise.
When driving in summer, the sound effects are created by tyres themselves, and in winter, noise comes from the adhesion of rubber to the road surface. According to experts, tread features are the most obvious reasons for the appearance of din.
What factors influence noise level of tyres?
A variety of different factors play a decisive role in the appearance of quite high noise level of tyres: from the quality of the tyres themselves to the road surface and environmental conditions. The most common reasons are:
- Reinforced carcass. It is used to increase the rigidity of the tyre. During driving on a rough road such tyres are protected from punctures, but in the same time the problem of increased noise level appears.
- Defective bearing. The sound it makes sometimes resembles a din of car tyres. Bearing failure may be caused by the tyre tread wear.
In the field of road construction, macadam is most often used as filler. Contact of macadam with the surface of tyres leads to the appearance of typical noise. At the same time, the interaction of stiff summer tyres with a porous surface is accompanied by a much louder din than in case of soft winter tyres. Noise can be louder in areas of the road surface where very fine filler was used.
Pressure in tyres
Over-inflated tyres are another reason for the increased noise level. When the tyre is over-inflated, the area of its adhesion to the road increases, which will inevitably lead to the intensification of an already unpleasant noise. Many car owners and service workers rarely pay attention to pressure indicators. Inflation should be carried out under control of a pressure gauge.