below Motorcycle helmet manufacturer Let's share the solution for helmet lens abrasion:

The first way is to buy another lens, provided that the brand helmet and the model are remembered

The second method is also the one I use. I buy some polishing powder, dip the deerskin mirror cloth in it to clean the lens. I bought two types of polishing powder, which are different in thickness. Large scratches are treated with coarse powder first. Generally, scratches are directly polished with fine powder, which is as bright as new. The polishing powder is very cheap, and more than four online polishing powders are enough.

It doesn't matter if the helmet lens is worn. We can solve the problem according to the above solution. I hope it can help everyone.

Generally speaking, the main way to choose a helmet size suitable for you is to measure your head circumference. The specific method is also very simple: use a tape measure to circle the wider part of the upper part of the ear, and measure the circumference. The specific figure of the circumference is your head circumference, which is generally measured in centimeters; After obtaining the head circumference, you can determine your helmet size according to the size chart provided by the helmet manufacturer. Take Arai's helmet as an example. A head circumference of 57cm - 58cm requires a helmet of size M. It is worth noting that each helmet manufacturer has a different size setting standard. Make sure you judge your size according to the size chart of the manufacturer who wants to buy the helmet, because there may be differences between manufacturers, leading to the wrong size. For example, the person who usually wears Arai with size M may need Suomy with size L to be big enough.

However, the accuracy of the size chart is relatively limited, and trying on is a more accurate way to judge the helmet suitable for you. The correct way to wear a helmet is to wear it forcefully from front to back instead of putting it on rudely and casually, which is very important and easy to ignore. If you find that after wearing the helmet every time, your ears will be folded in the helmet, and you must use your hands to poke them before opening your ears, it means that you are wearing the helmet in a wrong way.

The specific operation methods are as follows: First, hold the fixing belts on both sides of the helmet with the thumbs and forefinger of both hands, and gently cover the helmet to the upper quarter of the head; Then, the key steps to determine whether you are wearing a helmet correctly appear. Generally speaking, we will continue to pull the strap down until the whole head enters the helmet, which is actually wrong. The correct method is: after the head initially enters the helmet, hold the front chin of the helmet with the remaining six fingers of both hands except the belt, and pull down the front of the helmet until the entire helmet is put on. This technique sounds ordinary, but it is absolutely easy to use. Try it and you will know; Later, lock the helmet strap. This is very critical. Not locking the helmet strap is just as dangerous as not wearing a helmet. When a car falls, the helmet is likely to come out of the rider's head, which cannot protect it as it should.

If the helmet you wear is not a full helmet, but a three quarter helmet, half helmet or cross section helmet, and there is no design of the front jaw of the helmet, this technique can also be used. After the helmet is put on lightly, one hand continues to grasp the helmet belt, the other hand presses the front upper part of the helmet, and then both hands firmly put on the helmet. The more important requirement of this technique is that when wearing the helmet, the force is mainly applied to the front of the helmet rather than the back.