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Sizing Center

ARAI

Helmet Size

Head (inches)

Head (cm)

X-SMALL

20 7/8 – 21 ¼

53-54

SMALL

21 5/8 – 22

55-56

MEDIUM

22 ½ - 22 7/8

57-58

LARGE

23 ¼ - 23 5/8

59-60

X-LARGE

24 - 24 3/8

61-62

XX-LARGE

24 ¾ - 25 1/8

63-64

XXX-LARGE

25 ½ - 26

65-66

 

 

GMAX

Helmet Size

Head (inches)

Head (cm)

X-SMALL

21 ¼ - 21 5/8

54-55

SMALL

22 – 22 7/16

56-57

MEDIUM

22 13/16 – 23 ¼

58-59

LARGE

23 5/8 – 24

60-61

X-LARGE

24 3/8 – 24 13/16

62-63

XX-LARGE

25 3/16 – 25 5/8

64-65

XXX-LARGE

26 – 26 3/8

66-67

 

 

HJC

Helmet Size

Head (inches)

Head (cm)

XX-SMALL

20 - 20 1/2

51-52

X-SMALL

20 7/8 – 21 ¼

53-54

SMALL

21 5/8 – 22

55-56

MEDIUM

22 ½ - 22 7/8

57-58

LARGE

23 ¼ - 23 5/8

59-60

X-LARGE

24 - 24 3/8

61-62

XX-LARGE

24 ¾ - 25 ¼

63-64

XXX-LARGE

25 5/8 - 26

65-66

XXXX-LARGE

26 3/8 – 26 3/4

67-68

XXXXX-LARGE

27 ¼ - 27 5/8

69-70

 

 

NOLAN

Helmet Size

Head (inches)

Head (cm)

X-SMALL

20 7/8 – 21 ¼

53-54

SMALL

21 5/8 – 22

55-56

MEDIUM

22 ½ - 22 7/8

57-58

LARGE

23 ¼ - 23 5/8

59-60

X-LARGE

24 - 24 ½

61-62

XX-LARGE

24 7/8 – 25 ¼

63-64

 

 

 

 

VEGA

Helmet Size

Head (inches)

Head (cm)

X-SMALL

20.87 – 21.26

53-54

SMALL

21.65 – 22.05

55-56

MEDIUM

22.44 – 22.83

57-58

LARGE

23.23 – 23.62

59-60

X-LARGE

24.02 – 24.41

61-62

XX-LARGE

24.80 – 25.20

63-64

XXX-LARGE

25.60 – 26.00

65-66

XXXX-LARGE

26.40 – 26.80

67-68

XXXXX-LARGE

27.00 – 27.50

69-70

 

 

 

 

 

SHOEI

Helmet Size

Head (inches)

Head (cm)

XX-SMALL

20 1/8 – 20 ½

51-52

X-SMALL

20 7/8 – 21 ¼

53-54

SMALL

21 5/8 – 22

55-56

MEDIUM

22 ½ - 22 7/8

57-58

LARGE

23 ¼ - 23 5/8

59-60

X-LARGE

24 – 24 3/8

61-62

XX-LARGE

24 ¾ - 25 1/8

63-64

XXX-LARGE

25 5/8 – 26

65-66

 

 


 

Free Ground Shipping Via Fed Ex, UPS, or Postal Service (OUR CHOICE) Within the Continental United States for All Orders Over $99
 

Sierra will price match any advertised price on in stock items. Restrictions may apply. Please call for details.

 

 


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