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In addition to the issues of size, brand, and color, we often pay more attention to the material of the motorcycle helmet.

The general helmet shell is divided into four materials.

1.ABS resin is one of the five major synthetic resins, which is excellent in impact resistance, heat resistance, low temperature resistance, chemical resistance and electrical properties. It also has the characteristics of easy processing, stable product size, good surface gloss, etc. Packing and coloring.

2.Composite materials are materials that have new properties by macroscopically, by two or more different materials, by physical or chemical methods.

3.FRP, also known as GRP, is fiber reinforced plastic. It generally refers to the use of glass fiber reinforced unsaturated polyester, epoxy resin and phenolic resin matrix. It has nothing to do with steel. A reinforced plastic made of glass fiber or its products as a reinforcing material, called glass fiber reinforced plastic, or glass fiber reinforced plastic. Light and hard, non-conductive, high mechanical strength, low recycling, corrosion resistance.

4.Carbon fiber, as its name implies, is not only the inherent intrinsic property of carbon materials, but also the soft processability of textile fibers. It is a new generation of reinforcing fibers. Light weight, impact resistance, the best in the motorcycle helmet is carbon fiber. However, in the purchase, although we all know that the best weight of carbon fiber material is the lightest, it is because it is good, so the price is not cheap. However, even if it is made of carbon fiber, the weight of the motorcycle helmet will be controlled at around 1250g, because if the motorcycle helmet is too light, it will be affected by the airflow during high-speed driving, and the motorcycle helmet will be lifted up. At this time, the chin strap will be pulled. Living in your neck, I don't think it is comfortable to ride a bike like this.

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Changing the exhaust gas as an important part of motorcycle modification, many people who like to modify are often the first to modify the exhaust, the exhaust is divided into many kinds, there are back pressure, there are straight rows, there are semi-straight rows, and even variable valve exhaust, etc. .

Let's talk about the back pressure exhaust: This type of exhaust is the most common. Many of the original exhausts of the car are like this. Why do the original exhausts choose to back pressure? The main reasons are: 1. Silent, the country is exhausted. The noise decibel emissions are specified, not too high, too disturbing. 2 pollution, the same country also has strict emission standards for pollutants emitted from exhaust gas. The use of back pressure exhaust not only makes it easier to achieve emissions, but also achieves a good mute effect.

Because there is a muffler inside the exhaust pipe (some segments can be adjusted), the presence of the muffler can change the volume of the exhaust pipe circuit. In the process of exhausting, due to the lack of smoothness, part of the exhaust gas will return to form a back pressure in the pipe. Can effectively improve the combustion of the mixture. The exhaust is divided into the front section, the middle section and the tail section. Part of the back pressure exhaust is interrupted by a large back pressure pack, which makes the mute effect better and also slightly increases the low twist.

After the back pressure, we are talking about the straight row, the entire exhaust straight through, can make the exhaust more unobstructed and smoother discharge, improve the exhaust efficiency, and then slightly increase the speed. However, the direct noise is large, the emissions are not environmentally friendly, and it is easy to attract the attention of passers-by or the police. Generally, this kind of straight row is mostly used for track vehicles. The sounds that we hear on the street are the small pedals of the fried streets, the imitation cars of various brands, etc. are all such exhausts. Of course, the original exhaust of Harley is also straight. of.

Finally, the variable valve exhaust is mentioned. In the early days, this kind of exhaust gas almost did not exist. In recent years, it has gradually increased. However, it is really rare to use it on motorcycles. Many auto parts cities often modify the car. Variable valve exhaust. This type of exhaust pipe controls the exhaust through the valve, and different exhaust passages can be selected. This has the advantage that the exhaust can be switched back and forth in a silent and "violent" state.

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You must try on the helmet and you only know if the helmet is suitable for your head shape after the trial. A suitable helmet will fit snugly against your head, gently sway and will not loosen, and will not cause discomfort to your head. In addition, different brands or models of helmet size will also vary greatly, so it is highly recommended that you try to wear several brands of helmets, try several models of helmets to find the most suitable one.

Motorcycle helmets can be roughly divided into full-helmet and half-helmet according to the helmet type. According to the purpose, the full-face helmet can be divided into off-road helmets, road helmets, and rally helmets. The full helmet is the helmet with the best protection performance, and some half helmets are also used. Passed DOT or ECE safety certification, but in safety, it can't be compared with the full helmet. 

The simpler the design, the safer the helmet, such as the North American DOT certification requirements, the helmet strap must use the double D structure, the main reason is that the DD buckle is the safest and most reliable strap.

Nowadays, many Moyous purchase helmets are functions that pay too much attention to safety performance, which is very worrying. However, more and more humanized designs have indeed improved the riding comfort, such as the open helmet for the Mobility, the double-lens helmet that can easily open the small sunglasses, the helmet with Bluetooth design, the easy to ride the voice, the Bluetooth road condition is increased.

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Motorcycle helmet is a head protection device used by motorcycle drivers. The main purpose is to protect the user's head when subjected to external impact, to avoid or reduce the damage to the head and even to save the life of the driver.

Safety-certified helmets generally have little difference in safety performance. The difference between expensive helmets and cheap helmets is mainly in materials, comfort, ease of use, noise reduction, design, etc.; in terms of materials, carbon fiber helmets The most expensive (currently the carbon fiber is the lightest in the case of the same safety standards), the fiberglass helmet is moderately priced, and the ABS engineering plastic helmet is the most affordable. In terms of comfort, the more expensive the helmet is relatively comfortable, such as the lining material, the weight of the helmet, and the noise reduction ability directly affect the comfort of the use.

From the ease of use, such as vent layout, lens switch replacement, lens anti-fog performance, whether the liner is easy to disassemble and clean; in general, the more expensive the helmet is better in the above aspects.

If you are a professional driver or ready to drive a large displacement locomotive, you should pay special attention to the aerodynamic performance of the helmet. The top helmets must pass the wind tunnel test to reduce air resistance and increase the speed of high-speed riding. Safety and stability.

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