GMAX Helmet Sizing Chart

ADULT HELMETS
SIZE CM HAT SIZES INCHES
X-SMALL 54-55 6 3/4 21 1/4 - 21 5/8
SMALL 56-57 7 - 7 1/8 22 - 22 7/16
MEDIUM 58-59 7 1/4 - 7 3/8 22 13/16 - 23 1/4
LARGE 60-61 7 1/2 - 7 5/8 23 5/8 - 24
X-LARGE 62-63 7 3/4 - 7 7/8 24 3/8 - 24 13/16
2X-LARGE 64-65 8 - 8 1/8 25 3/16 - 25 5/8
3X-LARGE 66-67 8 1/4 - 8 3/8 26 - 26 3/8

YOUTH HELMETS
SIZE CM HAT SIZES INCHES
YOUTH SMALL 50-51 6 1/4 - 6 3/8 19 11/16 - 20 1/16
YOUTH MEDIUM 52-53 6 1/2 - 6 5/8 20 7/16 - 20 7/8
YOUTH LARGE 53.5 6 11/16 21
YOUTH SMALL/MEDIUM 50-51 6 1/4 - 6 3/8 19 11/16 - 20 1/16
YOUTH LARGE/X-LARGE 52-53 6 1/2 - 6 5/8 20 7/16 - 20 7/8

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