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Helmet Size Chart S 53-54 CM 20.9/21.3 Inch M 55-56 CM 21.7/22.0 Inch L 57-58 CM 22.4/22.8 Inch XL 59-60 CM 23.2/23.6 Inch Helmet Size Tips (1)Wrap a measuring tape around your head about a half-inch above eyebrows (2)Take measurement two to three...