What are the sizes of motorcycle helmets?

2 Answers
SanVincent
08/29/25 3:36am
Motorcycle helmet size chart is as follows: XS (53-54) S (55-56) M (57-58) L (59-60) XL (61). Introduction to helmets: Helmets are head protection equipment, worn by military personnel during training and combat, and are indispensable tools in transportation. Mostly semicircular in shape, they mainly consist of three parts: shell, lining, and suspension system. The shells are made of materials such as special steel, fiberglass, reinforced plastic, leather, and nylon to protect against bullets, shrapnel, and other impacts to the head. In ancient China, they were called zhou, shoukai, doumou, or toumou. Composition of helmets: Modern helmets mainly consist of the shell, lining, and suspension system. Due to different requirements for various activities, there are many structures and styles of helmets.
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LaZane
09/10/25 8:16am
I've been riding motorcycles for several years and have suffered from choosing the wrong helmet size. Motorcycle helmet sizing mainly depends on the head circumference, typically measured with a soft tape around the widest part of the forehead in centimeters. Sizes usually range from XS to XXL, with small being around 55-56cm, medium 57-58cm, and large 59-60cm. Sizes may vary slightly between brands, like Japanese brands tending to run smaller. Remember, trying it on is crucial: when you shake your head, the helmet shouldn't move, and there should be slight pressure on the cheeks without pain for safety. New helmets are a bit tight at first but will loosen with wear. Initially, I skipped trying it on, and my helmet almost flew off at high speed. Now, I always measure before buying and also consider the helmet type, like full-face or half-helmet, for comfort.
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