Why are there small rubber hairs on tires?
Some people wonder why there are tiny rubber hairs on new tires. Do they have anything to do with grip? Water drainage? Or are they related to snow? None of these things – these hairs have no use and are a side effect of production.
Tyre is made of layers of different materials, overlapped during the manufacturing process. At the very end, it is covered with rubber. At this point, the tyre is still completely smooth. At this stage of production, it is merely a mould from which the desired tread shape is extruded. For this purpose, a tyre goes into a special press. The walls of press are hot and cause the rubber to melt. At the same time, the machine pushes the tyre from the inside to mould it into the desired pattern. There are tiny holes in the walls of machine through which air trapped between the tyre and the walls of press escapes. As a result of pressure, after all the air has escaped, some rubber enters the holes and forms rubber hairs. These hairs are not removed, as they pose no risk to the use of tyres. In case of more expensive tyres, the manufacturing process is slightly different and uses more advanced equipment, so that the hairs do not form at all.