HJC YOUTH HELMET SIZE CONVERSION CHART
Size
Centimeter
Hat Size
Inches
Youth S
49-50
6 1/8 - 6 1/4
19 1/4 - 19 3/4
Youth M
51-52
6 3/8 - 6 1/2
20 - 20 1/2
Youth L
53-54
6 5/8 - 6 3/4
20 7/8 - 21 1/4
Youth S/M
49-50
6 1/8 - 6 1/4
19 1/4 - 19 3/4
Youth L/XL
51-52
6 3/8 - 6 1/2
20 - 20 1/2