View Helmet Size Chart Motorcycle Pictures. This helmet size chart has been compiled from helmet manufacturers' literature, sizing charts and years of experience assisting customers with helmet purchases. However, to help maximise head protection, the helmet must fit properly, and the retention system must be securely fastened under the chin.
Measure around the fullest part under the waist:
Record your sizes in both centimeters and inches then check the size chart provided to see the approximate helmet size fit for your head. Now, find your helmet size. Every brand has their own size chart, you can find these brand specific size charts on the product pages. When buying a helmet online, size is a major concern.