SIZE CHART

Never buy a used helmet or borrow someone else’s helmet. 

Over time the protective foam in helmets will  adjust to the contours of a user’s head. 

A used or borrowed helmet may not offer as much protection as a new helmet.

HELMET SIZE CONVENTION CHART

The size chart is only for reference. Always try the helmet on and follow this manual’s instructions for a proper fit.

SIZE

CM

HAT SIZE

INCHES

XX

51-52

6 3/8 - 6 1/2

20 - 20 1/2

XS

53-54

6 5/8 - 6 3/4

20 7/8 - 21 1/4

S

55-56

6 7/8 - 7

21 5/8 - 2

M

57-58

7 1/8 - 7 1/4

22 1/4 - 22 7/8

L

59-60

7 3/8 - 7 1/2

23 1/4 - 23 5/8

XL

61-62

7 5/8 - 7 3/4

24 - 24 3/8

2XL

63-64

7 7/8 - 8

24 3/4 - 25 1/4

3XL

65-66

8 1/8 - 8 1/4

25 5/8 - 26

4XL

67-68

8 3/8 - 8 1/2

26 3/8 - 26 3/4

HELMET SIZE CHART

RPHA SERIES, FG-JET, i71, i100, i90, i30, i20, i40, C10, C91, C80, V10, V60, V31, V90

SIZE

CENTIMETER

HAT SIZE

INCHES

*3XS

50-51

6 1/4 - 6 3/8

19 3/4 - 20 1/8

2XS

51-52

6 3/8 - 6 1/2

20 - 20 1/2

XS

53-54

6 5/8 - 6 3/4

20 7/8 - 21 1/4

S

55-56

6 7/8 - 7

21 5/8 - 2

M

57-58

7 1/8 - 7 1/4

22 1/4 - 22 7/8

L

59-60

7 3/8 - 7 1/2

23 1/4 - 23 5/8

XL

61-62

7 5/8 - 7 3/4

24 - 24 3/8

2XL

63-64

7 7/8 - 8

24 3/4 - 25 1/4

3XL

65-66

8 1/8 - 8 1/4

25 5/8 - 26

*The C10 is the only helmet available in 3XS (youth size).

** The RPHA 1, RPHA 11 and C10 are the only helmets available in 2XS.