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Bicycle Helmets Sizing Chart
 The circumference of the head should be measured at a point approximately one inch above the eyebrows in front, and at a point in the back of the head that results in the largest possible measurement. Take several measurements, to make sure you have the largest one.
PLEASE NOTE THAT THIS IS AN APPROXIMATE GUIDE AND NOT EXACT. THE SHAPE OF YOUR HEAD IS AS IMPORTANT AS YOUR HEAD MEASUREMENT WHICH MAY AFFECT FINAL FIT!
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Bell Bicycle Helmets
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Road and Mountain Category Models
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| Inches |
Size
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Metric(cm)
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| 20 - 21 5/8 |
Small
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51 - 55
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| 21 5 /8 - 23 1/4 |
Medium
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55 - 59
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| 23 1/4 - 24 3 /4 |
Large
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59 - 63
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Adult Fusion Sport Category Models
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| Inches |
Size
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Metric(cm)
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| 21 1/4 - 24 |
Universal
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54 - 61
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| 19 3/4 - 21 5/8 |
Universal Women's
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50 - 55
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| 22 7/8 - 25 1/2 |
Universal Large
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58 - 65
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Youth Fusion Sport Category Models
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| Inches |
Size
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Metric(cm)
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| 18 1/2 - 20 1/2 |
Infant T
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47 - 52
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| 19 3/4 - 21 5/8 |
Universal Child
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50 - 55
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| 21 5/8 - 22 3/8 |
Universal Youth
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50 - 57
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Giro Bicycle Helmets
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Adult Super Fit - Road and Mountain Models
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| Inches |
Size
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Metric(cm)
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| 20 - 21 5/8 |
Small
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51 - 55
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| 21 5 /8 - 23 1/4 |
Medium
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55 - 59
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| 23 1/4 - 24 3 /4 |
Large
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59 - 63
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Adult Universal Fit - Adult Sport Models
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| Inches |
Size
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Metric(cm)
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| 21 1/4 - 24 |
Universal
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54 - 61
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| 19 3/4 - 21 1/2 |
Universal Women's
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50 - 57
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| 22 1/2 - 24 5/8 |
Universal Large
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57 - 63
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Youth Universal Fit - Youth Models
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| Inches |
Size
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Metric(cm)
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| 18 1/2 - 20 1/2 |
Infant T
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47 - 52
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| 19 3/4 - 21 5/8 |
Universal Child
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50 - 55
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| 21 5/8 - 22 3/8 |
Universal Youth
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50 - 57
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