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Helmet Sizing
To measure your correct helmet size, measure the circumference of your head, like a headband, one inch above the eyebrows, above the ears. Match inch measurement to chart. If between sizes, choose the next larger size. Helmet should be snug but not overly tight.

509 | AFX | AGV | Bell | Daytona | Fly | Fox | Gmax | HJC | Icon | Joe Rocket | Klim
Nolan | Scorpion | Shift | Shoei | Sparx | Speed & Strength | Thor | Vega | Z1R | ZOX

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509 Helmets
  Centimeter (Hat Size) Hat Size Helmet Size
  54 6 5/8" – 6 3/4" XS
  56 6 7/8" – 7" S
  58 7-1/8 – 7-1/4 M
  60 7-3/8" – 7-1/2" L
  62 7-5/8" – 7-3/4" XL
  64 8 2XL

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AFX Helmets
Head Measurement Centimeter Hat Size Helmet Size
21-1/4" – 21-5/8" 54 – 55 6-3/4" – 6-7/8" XS
22" – 22-7/16" 56 – 57 7" – 7-1/8" S
22-13/16" – 23-1/4" 58 – 59 7-1/4 – 7-3/8 M
23-5/8" – 24" 60 – 61 7-1/2" – 7-5/8" L
24-3/8" – 24-13/16" 62 – 63 7-3/4" – 7-7/8" XL
25-3/16" – 25-5/8" 64 – 65 8 – 8-1/8" 2XL
26" – 26-3/8" 66 – 67 8-1/4" – 8-3/8" 3XL
26-3/4" – 27-1/8" 68 – 69 8-1/2" – 8-5/8" 4XL

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AGV Helmets
Head Measurement Centimeter Hat Size Helmet Size
21-1/4" – 21-5/8" 54 – 55 6-3/4" – 7" XS
22" – 22-3/8" 56 – 57 7" – 7-1/8" S
22-3/4" – 23-1/2" 58 – 59 7-1/4" – 7-1/2" M
23-1/2" – 24" 60 – 61 7-1/2" – 7-5/8" L
24-3/8" 62 – 63 7-3/4" XL
24-3/4" – 25-1/8" 64 – 65 7-7/8" – 8" 2XL

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Bell Helmets
Head Measurement Centimeter Hat Size Helmet Size
19-1/2" – 20" 50 – 51 5-7/8" – 6-1/8" YS
20" – 20-1/2" 51 – 52 6-1/8" – 6-3/8" YM
20-1/2" – 21" 52 – 53 6-3/8" – 6-5/8" YL
20-7/8" – 21-1/4" 53 – 54 6-5/8" – 6-3/4" XS
21-5/8" – 22" 55 – 56 6-7/8" – 7" S
22-3/8" – 22-3/4" 57 – 58 7-1/8" – 7-1/4" M
23-1/4" – 23-5/8" 59 – 60 7-3/8" – 7-1/2" L
24" – 24-3/8" 61 – 62 7-5/8" – 7-3/4" XL
24-3/4" – 25-1/4" 63 – 64 7-7/8" – 8" 2XL

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Daytona Helmets
Head Measurement Centimeter Hat Size Helmet Size
18 1/8" – 19"46 – 49 cm5 3/4" – 6"2XS
19 1/8" – 20"49 – 51 cm6 1/8" – 6 3/8"XS
20 1/8" – 21"52 – 54 cm6 1/2" – 6 5/8"S
21 1/8" – 22"54 – 56 cm6 3/4" – 7"M
22 1/8" – 23"57 – 59 cm7" – 7 1/4"L
23 1/8" – 2459 – 61 cm7 3/8" – 7 5/8"XL
24 1/8" – 25"62 – 64cm7 3/4" – 8"2XL
25 1/8" – 25 3/4"64 – 65 cm8" – 8 1/8"3XL
25 7/8" – 26 1/4"65 – 66 cm8 1/8" – 8 1/4"4XL
Youth Sizing
17 5/8" – 18" 45 – 46 cm Infant/Toddler S
18 1/8" – 18 1/2" 46 – 47 cm Toddler/Youth M
18 5/8" – 19" 48 – 49 cm Youth L

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Fly Helmets
Head Measurement Centimeter Hat Size Helmet Size
19-11/16" – 20-1/16" 49 – 50 6 YS
-- -- 6-1/8" – 6-1/4" YM
-- -- 6-3/8" – 6-1/2" YL/XXS
20-7/8" – 21-1/4" 53 – 54 6-5/8" – 6-3/4" XS
21-5/8" – 22" 55 – 56 6-7/8" – 7" S
22-3/8" – 22-3/4" 57 – 58 7-1/8" – 7-1/4" M
23-1/8" – 23-1/2" 59 – 60 7-3/8" – 7-1/2" L
24" – 24-3/8" 61 – 62 7-5/8" – 7-3/4" XL
24-3/4" – 25-1/8" 63 – 64 7-7/8" – 8" 2XL
-- -- -- 3XL

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 Fox Helmets     
Head Measurement     Helmet Size
20-1/2" – 21-1/8"     XS
21-1/4" – 22-1/8"     S
22-3/8" – 23-1/8"     M
23-1/4" – 23-3/4"     L
23-7/8" – 24-3/4"     XL
24-7/8" – 25-3/4"     XXL
Youth Sizing
18-3/4" – 19-5/8"     KS
19-1/4" – 20"     KM
20-1/8" – 21"     KL

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GMax Helmets
Head Measurement Centimeter Hat Size Helmet Size
19-11/16" – 20-1/16" 49 – 50 6-1/4" – 6-3/8" YS
-- -- -- YM
20-1/2" – 20-7/8" 52 – 53 6-1/2" – 6-5/8" YL/XXS
21-1/4" – 21-5/8" 54 – 55 6-3/4" – 6-7/8" XS
22" – 22-3/8" 56 – 57 7" – 7-1/8" S
22-3/4" – 23-1/8" 58 – 59 7-1/4" – 7-3/8" M
23-1/2" – 24" 60 – 61 7-1/2" – 7-5/8" L
24-3/8" – 24-3/4" 62 – 63 7-3/4" – 7-7/8" XL
25-1/8" – 25-1/2" 64 – 65 8" – 8-1/8" 2XL
26 66 8-1/4" 3XL

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HJC Helmets
Head Measurement Centimeter Hat Size Helmet Size
19-1/4" – 19-3/4" 49 – 50 6-1/8" – 6-1/4" Youth S/M
20" – 20-1/2" 51 – 52 6-3/8" – 6-1/2" Youth L/XL
20" – 20-1/2" 51 – 52 6-3/8" – 6-1/2" XXS
20-7/8" – 21-1/4" 53 – 54 6-5/8" – 6-3/4" XS
21-5/8" – 22" 55 – 56 6-7/8" – 7" S
22-1/2" – 22-7/8" 57 – 58 7-1/8" – 7-1/4" M
23-1/4" – 23 5/8" 59 – 60 7-3/8" – 7-1/2" L
24" – 24-3/8" 61 – 62 7-5/8" – 7-3/4" XL
24-3/4" – 25-1/4" 63 – 64 7-7/8" – 8" 2XL
25-5/8" – 26" 65 – 66 8-1/8" – 8-1/4" 3XL

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Icon Helmets
Head Measurement Centimeter Hat Size Helmet Size
20-7/8" – 21 1/4" n/a 6-5/8" – 6-3/4" XS
21-5/8" – 22" n/a 6-7/8" – 7" S
22-3/8" – 22-3/4" n/a 7-1/8" – 7-1/4" M
23-1/8" – 23-1/2" n/a 7-3/8" – 7-1/2" L
24" – 24-3/8" n/a 7-5/8" – 7-3/4" XL
24-3/4" – 25-1/4" n/a 7-7/8" – 8" 2XL

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Joe Rocket Helmets
Head Measurement Centimeter Hat Size Helmet Size
20-7/8" – 21 1/4" n/a 6-5/8" – 6-3/4" XS
21-5/8" – 22" n/a 6-7/8" – 7" S
22-3/8" – 22-3/4" n/a 7-1/8" – 7-1/4" M
23-1/8" – 23-1/2" n/a 7-3/8" – 7-1/2" L
24" – 24-3/8" n/a 7-5/8" – 7-3/4" XL
24-3/4" – 25-1/4" n/a 7-7/8" – 8" 2XL

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Klim Helmets
Head Measurement Centimeter   Helmet Size
20-7/8" – 21-1/4" 53 – 54 XS
21-5/8" – 22" 55 – 56 S
22-3/8" – 22-3/4" 57 – 58 M
23-1/4" – 23-5/8 59 – 60 L
24" – 24-3/8" 61 – 62 XL
24-3/4" – 25-1/4" 63 – 64 2XL
25-1/4" – 25-5/8" 65 – 66 3XL

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Nolan Helmets
Head Measurement Centimeter Hat Size Helmet Size
20-1/4" – 20-7/8" n/a 6-1/2" – 6-5/8" XS
21" – 21-5/8" n/a 6-3/4" – 6-7/8" S
21-3/4" – 22-3/8" n/a 7" – 7-1/8" M
22-1/2" – 23-1/8" n/a 7-1/4" – 7-3/8" L
23-1/4" – 24" n/a 7-1/2" – 7-5/8" XL
24-1/8" – 24-7/8" n/a 7-3/4" – 7-7/8" 2XL
25" – 25-5/8" n/a 8" – 8-1/8" 3XL

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Scorpion Helmets
Head Measurement Centimeter Hat Size Helmet Size
21-1/4" 53 – 54 6-5/8" – 6-3/4" XS
21-5/8" 55 – 56 6-7/8" – 7" SM
22-3/8" 57 – 58 7-1/8" – 7 1/4" MD
23-1/8" 59 – 60 7-3/8" – 7 1/2" LG
23-1/2" 61 – 62 7-5/8" – 7 3/4" XL
24-1/4" 63 – 64 7-7/8" – 8" 2XL
25-1/2" 65 – 66 8-1/8" – 8-1/4" 3XL
Youth Sizing "VX-9" only
19-1/4" 48 – 49 Y-SM Y-SM
20-1/8" 50 – 51 Y-MD Y-MD
20-7/8" 52 – 53 Y-LG Y-LG

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Shift Helmets
Head Measurement Centimeter Hat Size Helmet Size
20-1/8" – 21-1/2" 52 – 54 6 5/8" – 6 7/8" XS
21 1/4" – 22 1/8" 54 – 56 6 7/8" – 7 1/8" S
22 3/8" – 23 1/8" 57 – 59 7 1/8" – 7 3/8" M
23 1/4" – 23 3/4" 59 – 60 7 3/8" – 7 5/8" L
23 7/8" – 24 3/4" 59 – 63 7 5/8" – 7 7/8" XL
24 7/8" – 25 3/4" 61 – 65 7 7/8" – 8 1/4" 2XL
Youth Sizing
18 3/4" – 19 5/8" 47 – 48 5 7/8 YS
19 1/4" – 20" 49 – 50 6 1/8" – 6 1/4" YM
20 1/8" – 21" 51 – 52 6 3/8" – 6 1/2" YL

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Shoei Helmets
Head Measurement Centimeter Hat Size Helmet Size
19-3/4" – 20-1/8" 50 – 52 6-1/4" – 6-1/2" Childs S/M
21-1/4" 53 – 54 6-5/8" – 6-3/4" Childs L/XL
21-1/8" 51 – 52 6-3/8" – 6-1/2" XXS
21-1/4" 53 – 54 6-5/8" – 6-3/4" XS
21-5/8" 55 – 56 6-7/8" – 7" S
22-3/8" 57 – 58 7-1/8" – 7-1/4" M
23-1/8" 59 – 60 7-3/8" – 7-1/2" L
23-1/2" 61 – 62 7-5/8" – 7-3/4" XL
24-1/4" 63 – 64 7-7/8" – 8" 2XL
24-5/8" 65 – 66 8-3/8" – 8-1/2" 3XL

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Sparx Helmets
Head Measurement Centimeter Hat Size Helmet Size
20 1/2" – 20 7/8" 53 – 54 6-1/2" – 6-5/8" XS
21 1/4" – 21 5/8" 55 – 56 6 3/4" – 6 7/8" S
22" – 22 1/2" 57 – 58 7" – 7 1/8" M
22 7/8" – 23 1/4" 59 – 60 7 1/4" – 7 3/8" L
23 5/8" – 24" 61 – 62 7 1/2" – 7 5/8" XL
24 1/2" – 24 7/8" 63 – 64 7-3/4" – 7-7/8" 2XL

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Speed & Strength
Head Measurement   Hat Size Helmet Size
20 7/8" – 21 1/4" 6 1/2" – 6 5/8" XS
21 5/8" – 22" 6 3/4" – 6 7/8" S
22 1/2" – 22 7/8" 7" – 7 1/8" M
23 1/4" – 23 5/8" 7 1/4" – 7 3/8" L
24" – 24 3/8" 7 1/2" – 7 5/8" XL
24 3/4" – 25 1/4" 7 3/4" – 7 7/8" 2XL

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Thor Helmets
Head Measurement Centimeter Hat Size Helmet Size
20" – 20-1/2" 51 – 52 6-3/8" – 6-1/2" XXS
20-3/4" – 21-1/4" 53 – 54 6-5/8" – 6-3/4" XS
21-5/8" – 22" 55 – 56 6-7/8" – 7" SM
22-1/2" – 22-3/4" 57 – 58 7-1/8" – 7-1/4" MD
23-1/4" – 23-5/8" 59 – 60 7-3/8" – 7-1/2" LG
24" – 24-1/2" 61 – 62 7-5/8" – 7 3/4" XL
24-3/4" – 25-1/4" 63 – 64 7-7/8" – 8" 2XL

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Vega Helmets
Head MeasurementCentimeterHat SizeHelmet Size
20.87" – 21.26"53 – 546-5/8" – 6-3/4"XS
21.65" – 22.05"55 – 566-7/8" – 7"S
22.44" – 22.83"57 – 587-1/8" – 7-1/4"M
23.23" – 23.6259 – 607-3/8" – 7-1/2"L
24.02" – 24.41"61 – 627-5/8" – 7-3/4"XL
24.8" – 25.2"63 – 647-7/8" – 8"2XL
25.6" – 26"65 – 668-1/8" – 8-1/4"3XL
26.4" – 26.8"67 – 688-3/8 – 8-1/2"4XL
27" – 27.5"69 – 708-5/8" – 8-3/4"5XL
Youth Sizing
19.15" – 19.5"49 – 50S
20.10" – 20.45"51 – 52M
20.87" – 21.26"53 – 54L

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Z1R Helmets
Head Measurement Centimeter Hat Size Helmet Size
20" – 20-1/2" 51 – 52 6-3/8" – 6-1/2" XXS
20-3/4" – 21-1/4" 53 – 54 6-5/8" – 6-3/4" XS
21-5/8" – 22" 55 – 56 6-7/8" – 7" SM
22-3/8" – 22-3/4" 57 – 58 7-1/8" – 7-1/4" MD
23-1/8" – 23-5/8" 59 – 60 7-3/8" – 7-1/2" LG
24" – 24-1/2" 61 – 62 7-5/8" – 7 3/4" XL
24-3/4" – 25-1/4" 63 – 64 7-7/8" – 8" 2XL

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ZOX Helmets
Head Measurement Centimeter Hat Size Helmet Size
20 1/8" – 20 1/2" 51 – 52 6 3/8" – 6 1/2" XXS
20 7/8" – 21 1/4" 53 – 54 6 5/8" – 6 3/4" XS
21 5/8" – 22" 55 – 56 6 7/8" – 7" S
22 1/2" – 22 7/8" 57 – 58 7 1/8" – 7 1/4" M
23 1/4" – 23 5/8" 59 – 60 7 3/8" – 7 1/2" L
24" – 24 3/8" 61 – 62 7 5/8" – 7 3/4" XL
24 3/4" – 25 1/2" 63 – 64 7 7/8" – 8" 2XL
25 5/8" – 26" 65 – 66 8 1/8" – 8 1/4" 3XL
26 3/8" – 26 3/4" 67 – 68 8 3/8" – 8 1/2" 4XL
27 1/8" – 27 1/2" 69 – 70 8 5/8" – 8 3/4" 5XL
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