Bell Helmets Sizing Chart

Helmet Size	CM	IN	Hat Size (IN)
XS	53–54	20 7/8 – 21 1/4	6 5/8 – 6 3/4
S	55–56	21 5/8 – 22	6 7/8 – 7
M	57–58	22 1/2 – 22 3/4	7 1/8 – 7 1/4
L	58–59	22 3/4 – 23 1/4	7 1/4 – 7 3/8
XL	60–61	23 5/8 – 24	7 1/2 – 7 5/8
XXL	62–63	24 1/2 – 24 3/4	7 3/4 – 7 7/8
XXXL	64–65	25 1/8 – 25 5/8	8 – 8 1/8

Helmet Size	CM	IN	Hat Size (IN)
S	49–51	19–20 1/8	6–6 3/8
M	51–52	20 1/8–20 1/2	6 3/8–6 1/2
L	52–53	20 1/2–20 7/8	6 1/2–6 5/8