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Conversion Chart

HEAD SIZE INCHES HEAD SIZE CM HAT SIZE
19  50 ¼
20 51 6
20 ⅜ 52 6 ½
20 ¾ 53 6 ⅝
21 ¼ 54 6 ¾
21  55 6 ⅞
22 56 7
22  57 7 ⅛
22 ¾ 58 7 ¼
23  59
23  60 7 ½
24 61 7 ⅝
24  62 7 ¾

Disclaimer: This conversion chart is a guide only and does not constitute a guarantee as to the fit of the helmet. Some people may have a unique head shape changing what size they need. Some helmets fit different shaped heads better than others.