39+ Helmet Size Chart Adults PNG. 1.2 appropriate helmet sizes for children compared to the circumference of the head; For maximum protection the helmet must fit properly with the chin strap securely fastened and provide adequate peripheral vision.
A snug, aligned fit will achieve a safe and secure ride.
Small helmets are generally less than 21 ½ inches. Child motorcycle helmet size chart: For helmet size, measure the circumference of the head just above the ears and refer to the chart for accurate sizing. This is an approximate chart.