Biltwell Helmet Size Chart

Helmets
Size Inches Centimeters
X-Small 20 1/4 - 20 3/4 51.5 - 52.75
Small 20 7/8 - 21 3/8 53 - 54.25
Medium 21 1/2 - 22 54.5 - 55.75
Large 22 1/8 - 22 5/8 56 - 57.25
X-Large 22 3/4 - 23 1/4 57.5 - 58.75
2X-Large 23 3/8 - 23 7/8 59 - 60.25

Sizing information is provided by the manufacturer and does not guarantee a perfect fit. Please use this chart as a guide only.