Circumference (mm) Diameter (mm) Europe UK & Australia United States & Canada China Singapore & Japan Hong Kong Switzerland
44.2 14.1 44 3 6 4 6 4
44.8 14.3 45 G 5
45.5 14.5 7 7.5
46.1 14.7 46 H 6
46.8 14.9 47 4 8 7 9
47.4 15.1 I 9
48.0 15.3 48 8 10
48.7 15.5 J 9
49.3 15.7 49 5 10 9 11
50.0 15.9 50 K 10
50.6 16.1 11 10 12
51.2 16.3 51 L 11¾
51.9 16.5 52 6 12 11 13 12¾
52.5 16.7 M 13 12
53.1 16.9 53 13 14.5 14
53.8 17.1 N 14
54.4 17.3 54 7 14 16 15¼
55.1 17.5 55 O 15
55.7 17.7 15 17 16½
56.3 17.9 56 P 16
57.0 18.1 57 8 17 16 17¾
57.2 18.2 18
57.6 18.3 Q
58.3 18.5 58 18 17 19
58.9 18.8 59 R 19
59.5 19.0 9 19 18 20.5
60.2 19.2 60 S 20 20¼
60.8 19.4 61 19 22
61.4 19.6 T 21 21½
62.1 19.8 62 10 20 23
62.7 20.0 U 22 21
63.4 20.2 63 10½ 22 24 22¾
64.0 20.4 64 V 23
64.6 20.6 11 23 25
65.3 20.8 65 W 24 25
65.9 21.0 66 11½ 25 24 26
66.6 21.2 X
67.2 21.4 67 12 26 25 27.75 27½
67.8 21.6 Y
68.5 21.8 68 Z 12½ 26 28¾
69.1 22.0 69
69.7 22.2 70 13 27 30
70.4 22.4 Z+1
71.0 22.6 Z+2 13½

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