Circumference (mm) Diameter(mm) US 

UK

&

Australia

Germany

&

France

Spain 

&

Italy 

Japan 

&

China

46.8 mm 15 mm 4 H 46.8 6.5 7
48 mm 15.3 mm 4.5 I 48 8 8
49.3 mm 15.6 mm 5 J 49.3 9.5 9
50.6 mm 16.2 mm 5.5 K 50.6 10.5 10
51.9 mm 16.6 mm 6 L 51.9 12 11
53.1 mm 16.9 mm 6.5 M 53.1 13.5 13
54.4 mm 17.2 mm 7 N 54.4 14.5 14
55.7 mm 17.8 mm 7.5 O 55.7 16 15
57.0 mm 18.1 mm 8 P 57 17 16
58.3 mm 18.5 mm 8.5 Q 58.3 18.5 17
59.5 mm 19.1 mm 9 R 59.5 20 18
60.8 mm 19.4 mm 9.5 S 60.8 21 19
62.1 mm 19.7 mm 10 T 62.1 22.5 20
63.4 mm 20.4 mm 10.5 U 63.4 23.5 22
64.6 mm 20.7 mm 11 V 64.6 25 23
65.9 mm 21.0 mm 11.5 W 65.9 26 24
67.2 mm 21.6 mm 12 X 67.2 27.5 25

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