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| Inside Diameter | Inside Circumference | Sizing | |||||||
|---|---|---|---|---|---|---|---|---|---|
| MM | Inches | MM | Inches | British & Australian | US & Canada | French & Russian | German | Japanese | Swiss |
| 14.05 | 0.553 | 44.14 | 1.74 | F | 3 | 44 | 14 | 4 | 4 |
| 14.25 | 0.561 | 44.77 | 1.76 | F 3/4 | 3 1/4 | - | - | - | - |
| 14.45 | 0.569 | 45.4 | 1.79 | G 1/4 | 3 1/2 | - | 14 1/2 | - | - |
| 14.65 | 0.577 | 46.02 | 1.81 | H | 3 3/4 | 46 1/2 | - | - | 6 1/2 |
| 14.86 | 0.585 | 46.68 | 1.84 | H 1/2 | 4 | - | 15 | 7 | - |
| 15.04 | 0.592 | 47.25 | 1.86 | I | 4 1/4 | 47 3/4 | - | - | 7 3/4 |
| 15.27 | 0.601 | 47.97 | 1.89 | I 1/2 | 4 1/2 | - | 15 1/4 | 8 | - |
| 15.53 | 0.611 | 48.79 | 1.92 | J 1/4 | 4 3/4 | - | - | - | - |
| 15.7 | 0.618 | 49.32 | 1.94 | J 1/2 | 5 | - | 15 3/4 | 9 | - |
| 15.9 | 0.626 | 49.95 | 1.97 | K 1/4 | 5 1/4 | - | - | - | - |
| 16 | 0.63 | 50.27 | 1.98 | K 1/2 | 5 3/8 | - | - | 10 | - |
| 16.1 | 0.634 | 50.58 | 1.99 | L | 5 1/2 | 51 3/4 | 16 | - | 11 3/4 |
| 16.3 | 0.642 | 51.21 | 2.02 | L 1/4 | 5 3/4 | - | - | - | - |
| 16.51 | 0.65 | 51.87 | 2.04 | M | 6 | 52 3/4 | 16 1/2 | 12 | 12 3/4 |
| 16.71 | 0.658 | 52.5 | 2.07 | M 1/2 | 6 1/4 | - | - | - | - |
| 16.92 | 0.666 | 53.16 | 2.09 | N | 6 1/2 | 54 | 17 | 13 | 14 |
| 17.13 | 0.674 | 53.82 | 2.12 | N 1/2 | 6 3/4 | - | - | - | - |
| 17.35 | 0.683 | 54.51 | 2.15 | O | 7 | 55 1/4 | 17 1/4 | 14 | 15 1/4 |
| 17.45 | 0.687 | 54.82 | 2.16 | O 1/2 | 7 1/4 | - | - | - | - |
| 17.75 | 0.699 | 55.76 | 2.2 | P | 7 1/2 | 56 1/2 | 17 3/4 | 15 | 16 1/2 |
| 17.97 | 0.707 | 56.45 | 2.22 | P 1/2 | 7 3/4 | - | - | - | - |
| 18.19 | 0.716 | 57.15 | 2.25 | Q | 8 | 57 3/4 | 18 | 16 | 17 3/4 |
| 18.35 | 0.722 | 57.65 | 2.27 | Q 1/2 | 8 1/4 | - | - | - | - |
| 18.53 | 0.729 | 58.21 | 2.29 | Q 3/4 | 8 1/2 | - | 18 1/2 | 17 | - |
| 18.69 | 0.736 | 58.72 | 2.31 | R 1/4 | 8 3/4 | - | - | - | - |
| 18.89 | 0.748 | 59.34 | 2.35 | R 3/4 | 9 | - | 19 | 18 | - |
| 19.22 | 0.757 | 60.38 | 2.38 | S 1/4 | 9 1/4 | - | - | - | - |
| 19.41 | 0.764 | 60.98 | 2.4 | S 3/4 | 9 1/2 | - | 19 1/2 | 19 | - |
| 19.62 | 0.772 | 61.64 | 2.43 | T 1/4 | 9 3/4 | - | - | - | - |
| 19.84 | 0.781 | 62.33 | 2.45 | T 1/2 | 10 | - | 20 | 20 | - |
| 20.02 | 0.788 | 62.89 | 2.48 | U | 10 1/4 | 62 3/4 | - | 21 | 22 3/4 |
| 20.2 | 0.797 | 63.46 | 2.5 | U 1/2 | 10 1/2 | - | 20 1/4 | 22 | - |
| 20.44 | 0.805 | 64.21 | 2.53 | V 1/4 | 10 3/4 | - | - | - | - |
| 20.68 | 0.814 | 64.97 | 2.56 | V 1/2 | 11 | - | 20 3/4 | 23 | - |
| 20.85 | 0.821 | 65.5 | 2.58 | W 1/4 | 11 1/4 | - | - | - | - |
| 20.94 | 0.824 | 65.78 | 2.59 | W 1/2 | 11 3/8 | - | - | - | - |
| 21.08 | 0.83 | 66.22 | 2.61 | W 3/4 | 11 1/2 | - | 21 | 24 | - |
| 21.24 | 0.836 | 66.73 | 2.63 | X 1/4 | 11 3/4 | - | - | - | - |
| 21.49 | 0.846 | 67.51 | 2.66 | Y | 12 | 67 1/2 | 21 1/4 | 25 | 27 1/2 |
| 21.69 | 0.854 | 68.14 | 2.68 | Y 1/2 | 12 1/4 | - | - | - | - |
| 21.89 | 0.862 | 68.77 | 2.71 | Z | 12 1/2 | 68 3/4 | 21 3/4 | 26 | 28 3/4 |
| 22.1 | 0.87 | 69.43 | 2.73 | Z +1/2 | 12 3/4 | - | - | - | - |
| 22.33 | 0.879 | 70.15 | 2.76 | Z+1 | 13 | - | 22 | 27 | - |
| 22.6 | 0.89 | 71 | 2.8 | Z+1.5 | 13.5 | - | - | - | - |
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