US/CA (Reference Size) EU / FR UK IT Diameter (mm) Circumference (mm)
5 49 J 9 15.7 49.3
6 52 L 12 16.5 51.8
7 54 N 14 17.3 54.3
8 57 P 17 18.1 56.9
9 59 R 20 19 59.7
10 62 T 22 19.8 62.2
11 64 V 24 20.6 64.7