At present, everyone chooses Electric vehicle helmet Do you know that you need to measure your head circumference, and then tell the electric helmet manufacturer to recommend a size. But there are still many people who buy helmets in this way and find that they are uncomfortable, pinched or worn loosely for a period of time. What is the reason for the swaying of the wind as soon as the speed of cycling increases?
Is the size of uncomfortable chuck small? Or is the size too big to swing around?
Shape of EPS inner chamber of helmet
The shape of EPS cavity of helmet can be divided into three types according to the width length ratio: long ellipse, middle ellipse and near circle.
At present, there are fewer and fewer long oval helmets for electric vehicles. Because there are too few people applicable to them, more and more manufacturers of electric vehicle helmets are producing middle oval helmets, while near round helmets may account for more and more in Asia.
Shape of human brain
Because the cross section shape of each person's head is different, each region or country will have its own standard. This standard comes from the survey of local population samples, and can be used to produce ordinary hats, such as baseball caps, as well as sports helmets, ski helmets, bicycle helmets, motorcycle helmets and other reference standards.
On the definition of helmet head type, the experience data of each electric helmet manufacturer may be different, so not all helmet data are very uniform. According to the measurement experience and many data investigation and analysis, as shown in the blue value below, it is reasonable to guess:
1. The more to the right, the closer to 85%, that is, ROUND head type;
2. The more to the left, the closer to 75%, that is, long ellipse;
3. In the middle value, it means that it is around 80%, that is, the middle ellipse;
This is probably the data of lumen width length ratio of three helmet head types.
Before we buy a helmet, the first thing we need to know is what type of head you belong to. If you don't know your head type, then the helmet you choose is likely to have the problems mentioned above. It is either clamped or easy to shake after wearing for a long time.
How to choose? Summarize in four sentences:
1. Determine your head shape and head circumference instead of just measuring your head circumference.
2. Determine the helmet head type you like. If it does not match your head type, it is recommended to choose another one.
3. Choose the right size. The right size shows that you don't shake from left to right after wearing it, and don't slide back and forth after tying the harness, especially you can't take the helmet out from back to front.
4. If you are comfortable in all aspects, try it on for 5-10 minutes, and finally see if this helmet is suitable for you.
The helmet selected through such a process should not cost you money. Only by combining your head shape to choose a helmet, can you choose the most suitable helmet for yourself. It will also be a safer helmet for you.
