HJC Helmet Size Conversion Chart
 
 
Size
Centimeter
Hat Size
Inches

XXS
  
51-52
  
6 3/8 - 6 1/2
  20- 20 1/2  

XS
  
53-54
  
6 5/8 - 6 3/4
  20 7/8 - 21 1/4  

 
S
  
55-56
  
6 7/8 - 7
  21 5/8 - 22  

M
  
57-58
  
7 1/8 - 7 1/4
  22 1/2 - 22 7/8  

L
  
59-60
  
7 3/8 - 7 1/2
  23 1/4 - 23 5/8  

XL
  
61-62
  
7 5/8 - 7 3/4
  24 - 24 3/8  

XXL
  
63-64
  
7 7/8 - 8
  24 3/4 - 25 1/4  

XXXL
  
65-66
  
8 1/8 - 8 1/4
  25 5/8 - 26  
Youth S
  
49-50
   6 1/8 - 6 1/4   19 1/4 - 19 3/4  
Youth M
 
51-52
   6 3/8 - 6 1/2   20 - 20 1/2  
Youth L
 
53-54
   6 5/8 - 6 3/4   20 7/8 - 21 1/4  
Youth S/M
49-50
6 1/8 - 6 1/4
19 1/4 - 19 3/4
 
Youth L/XL
51-52
6 3/8 - 6 1/2
20 - 20 1/2
 

 
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