Helmet size Europe
XS
S
M
L
XL
XXL
XXXL
head circumference (cm)
53-54
55-56
57-58
59-60
61-62
63
64
head circumference (Inch)
20 7/8 - 21 1/4
21 5/8 - 22
22 1/2 - 22 7/8
23 1/4 - 23 5/8
24 - 24 3/8
24 3/4 - 25 1/4
25 5/8 - 26
Helmet size US
6 5/8 - 6 3/4
6 7/8 - 7
7 1/8 - 7 1/4
7 3/8 - 7 1/2
7 5/8 - 7 3/4
7 7/8 - 8
8 1/8 - 8 1/4