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Helmet Size

Racing helmets

helmet size measurement metric
XS 6-5/8 to 6-3/4 20-7/8 to 21-1/4 53 to 54
S 6-7/8 to 7 21-5/8 to 22 55 to 56
M 7-1/8 to 7-1/4 22-3/8 to 22-3/4 57 to 58
L 7-3/8 to 7-1/2 23-1/8 to 23-1/2 59 to 60
XL 7-5/8 to 7-3/4 23-7/8 to 24-1/4 61 to 62
2XL 7-7/8 to 8 24-3/4 to 25-1/8 63 to 64

CMR helmets

helmet size measurement metric
XS 6-1/2 to 6-5/8 20-1/2 to 20-7/8 52 to 53
S 6-3/4 to 6-7/8 21-1/4 to 21-5/8 54 to 55
M 6-7/8 to 7 21-5/8 to 22 55 to 56
L 7-1/8 to 7-1/4 22-3/8 to 23-3/4 57 to 58

Rookie helmets

helmet size measurement metric
One size 6-3/4 to 7 21-1/4 to 22 54 to 56