HJC Helmet Size Chart

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

Helmet Size Convention Chart
SIZE	CENTIMETER	HAT SIZE	INCHES
XXS	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 – 22
M	57 - 58	7 1/8 – 7 1/4	22 1/2 – 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
5XL	69 - 70	8 3/4 – 8 3/4	27 1/4 – 27 5/8

RPHA Series, FG-Jet, FG-17 Helmet Size Chart (Only FG-17 is available up to size 3XL)
SIZE	CENTIMETER	HAT SIZE	INCHES
XS	54 – 55	6 3/4 – 6 7/8	21 1/4 – 21 5/8
S	55 – 56	6 7/8 – 7	21 5/8 – 22
M	57 – 58	7 1/8 – 7 1/4	22 1/2 – 22 7/8
L	58 – 59	7 1/4 – 7 3/8	22 7/8 – 23 1/4
XL	60 – 61	7 1/2 – 7 5/8	23 5/8 – 24
2XL	62 – 63	7 3/4 – 7 7/8	24 3/8 – 24 3/4
3XL	64 – 65	8 – 8 1/8	25 1/4 – 25 5/8