Circumference (mm)Diameter (mm)EuropeUK & AustraliaUnited States & CanadaChinaSingapore & JapanHong KongSwitzerland
44.214.14436464
44.814.345G5
45.514.577.5
46.114.746H6
46.814.9474879
47.415.1I9
48.015.348810
48.715.5J9
49.315.749510911
50.015.950K10
50.616.1111012
51.216.351L11¾
51.916.552612111312¾
52.516.7M1312
53.116.9531314.514
53.817.1N14
54.417.3547141615¼
55.117.555O15
55.717.7151716½
56.317.956P16
57.018.1578171617¾
57.218.218
57.618.3Q
58.318.558181719
58.918.859R19
59.519.09191820.5
60.219.260S2020¼
60.819.4611922
61.419.6T2121½
62.119.862102023
62.720.0U2221
63.420.26310½222422¾
64.020.464V23
64.620.6112325
65.320.865W2425
65.921.06611½252426
66.621.2X
67.221.46712262527.7527½
67.821.6Y
68.521.868Z12½2628¾
69.122.069
69.722.270132730
70.422.4Z+1
71.022.6Z+213½

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