1. How is the tire lanugo produced?  
There are many small holes processed on the tire mold to exhaust the gas generated during tire molding. After the tire is molded and cooled in the mold, part of the rubber remains in the mold exhaust hole. After the tire is taken out of the mold, the rubber in the exhaust hole forms the tire hair that you can see attached to the tire surface.  
2. The lanugo can test the quality of the tire
This theory is feasible. Pulling the lanugo can be used to test the quality of the tire rubber. It can be elongated and difficult to break the surface. The rubber is better. On the contrary, it means that the rubber is of poor quality or expired products. However, it can not be completely relied on to judge the advantages and disadvantages of tire rubber. The amount of lanugo will not affect the quality of tyres, nor can the quality of tyres be judged by the amount of lanugo.  
3. There are lanugs on all tyres
All tyres will produce lanugo in the production process. However, the problem of lanugo has been solved by the tyre manufacturers with advanced technology. For the sake of beauty, the procedure of removing lanugo has been added. Some tyre manufacturers do not remove lanugo in order to save costs, but it has no impact on the use of tyres.  
4. It can be used to identify the new and old tires
As long as the tire is not subject to the depilation procedure, the experienced person can identify the new and old degree of the tire through the depilation procedure, but this cannot be identified by the presence or absence of the depilation procedure. As mentioned earlier, some tires have been depilated, and some are still in good condition even if they have been in the form for a long time. At this time, the tire is already an old tire.  
5. Whether the tire tire tire hair affects driving safety
It can be very responsible to say that 100% will not. Please feel free to drive a car with tires with lanugo.  
6. Will fetal hair increase fetal dryness?  
This is negative. The main reason for tire dryness is that when the vehicle is running at high speed, the tire rotates at high speed, and the air in the tire pattern is squeezed and then released. This continuous "squeeze release" will produce noise. The faster the vehicle speed, the heavier the body, and the greater the noise. In this case of high-speed rotation, the role of fetal hair is basically ignored.  
7. Does lanugo increase grip?  
This also only exists on the theoretical level. If the tire surface is more rough due to the presence of lanugo, it will undoubtedly increase the friction force in theory. However, the little lanugo plays the role of friction, which is just a drop in the ocean for tyres. It is not worth mentioning. So if someone fools you with tyre hair and says that the tyre with tyre hair has high friction, you can refute it directly.