Hjc Bto Helmet Sizing Chart
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1HELMET SIZING
ADULT MX
HELMET SIZE
XX- SMALL
X- SMALL
SMALL
MEDIUM
LARGE
X- LARGE 2X- LARGE 3X- LARGE 4X- LARGE
5X- LARGE
6 3/8 - 6 1/2
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
8 3/8 - 8 1/2
8 3/4
USA HAT SIZE
20 - 20 1/2
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
26 3/8 - 26 3/4
27 1/4 - 27 5/8
INCHES
54 - 55
53 - 54
55 - 56
57 - 58
59 - 60
61 - 62
63 - 64
65 - 66
67 - 68
69 - 70
CENTIMETERS
YOUTH
HELMET SIZE
SMALL/MEDIUM
LARGE/X- LARGE
6 1/8 - 6 1/4
6 3/8 - 6 1/2
USA HAT SIZE
19 1/4 - 19 3/4
20 - 20 1/2
INCHES
49 - 50
51 - 52
CENTIMETERS
YOUTH
HELMET SIZE
SMALL
MEDIUM
LARGE
6 1/8 - 6 1/4
6 3/8 - 6 1/2
6 5/8 - 6 3/4
USA HAT SIZE
19 1/4 - 19 3/4
20 - 20 1/2
20 7/8 - 21 1/4
INCHES
49 - 50
51 - 52
53 - 54
CENTIMETERS
RPHA SERIES, FG-JET
HELMET SIZE
X- SMALL
SMALL
MEDIUM
LARGE
X- LARGE
2X- LARGE
6 3/4 - 6 7/8
6 7/8 - 7
7 1/8 - 7 1/4
7 1/4 - 7 3/8
7 1/2 - 7 5/8
7 3/4 - 7 7/8
USA HAT SIZE
21 1/4 - 21 5/8
21 5/8 - 22
22 1/2 - 22 7/8
22 7/8 - 23 1/4
23 5/8 - 24
24 3/8 - 24 3/4
INCHES
54 - 55
55 - 56
57 - 58
58 - 59
60 - 61
62 - 63
CENTIMETERS
FG-17
HELMET SIZE
X- SMALL
SMALL
MEDIUM
LARGE
X- LARGE
2X- LARGE 3X- LARGE
6 3/4 - 6 7/8
6 7/8 - 7
7 1/8 - 7 1/4
7 1/4 - 7 3/8
7 1/2 - 7 5/8
7 3/4 - 7 7/8
7 3/4 - 7 7/8
USA HAT SIZE
21 1/4 - 21 5/8
21 5/8 - 22
22 1/2 - 22 7/8
22 7/8 - 23 1/4
23 5/8 - 24
24 3/8 - 24 3/4
24 3/8 - 24 3/4
INCHES
54 - 55
55 - 56
57 - 58
58 - 59
60 - 61
62 - 63
62 - 63
CENTIMETERS
HOW TO MEASURE helmet size
men, woMEN AND YOUTH
Measure the largest circumference of head; usually just above ears and
1 inch above eyebrows
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