Helmet Size

Inches

Centimeters

X-Small

20 7/8 - 21 1/4

53 - 54

Small

21 5/8 - 22

55 - 56

Medium

22 3/8 - 22 3/4

57 - 58

Large

23 1/4 - 23 5/8

59 - 60

X-Large

24 - 24 3/8

61 - 62