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Dia (mm) Circ (mm) US & CA UK & AU Europe
14.1 44.2 3 F 44
14.3 44.8 3.25 45
14.5 45.5 3.5 G
14.7 46.1 3.75 46
14.9 46.8 4 H 47
15.1 47.4 4.25
15.3 48.0 4.5 I 48
15.5 48.7 4.75
15.7 49.3 5 J 49
15.9 50.0 5.25 50
16.1 50.6 5.5 K
16.3 51.2 5.75 51
16.5 51.9 6 L 52
16.7 52.5 6.25
16.9 53.1 6.5 M 53
17.1 53.8 6.75
17.3 54.4 7 N 54
17.5 55.1 7.25 55
17.7 55.7 7.5 O
17.9 56.3 7.75 56
18.1 57.0 8 P 57
18.3 57.6 8.25 Q
18.5 58.3 8.5
18.7 58.9 8.75 R 58
18.9 59.5 9 59
19.1 60.2 9.25 S
19.4 60.8 9.5 60
19.6 61.4 9.75 T 61
19.8 62.1 10
20.0 62.7 10.25 U 62
20.2 63.4 10.5
20.4 64.0 10.75 V 63
20.6 64.6 11 64
20.8 65.3 11.25 W
21.0 65.9 11.5 65
21.2 66.6 11.75 X 66
21.4 67.2 12
21.6 67.9 12.25 Y 67
21.8 68.5 12.5 Z
22.0 69.1 12.75 68
22.2 69.8 13 69
22.4 70.4 13.25 70
22.6 71.0 13.5
22.8 71.7 13.75
23.0 72.3 14
23.2 72.8 14.25
23.4 73.5 14.5
23.6 74.1 14.75
23.8 74.7 15