Size chart
EU size Inner diameter (mm) US size UK size
48 15.3 4.5 I½
50 15.9 5 J½
52 16.5 6 L½
54 17.2 7 N½
56 17.8 8 P½
58 18.5 8.5–9 Q½–R½
60 19.1 9–9.5 S–S½
62 19.7 10 T½
64 20.4 10.5–11 V–W
66 21.0 11.5–12 X–Y