Rings
| USA Size |
Rim (mm) |
UK, EU & AU |
CN /SG/JP |
HK | CH |
|---|---|---|---|---|---|
| 4 | 47 | I | 7 | 9 | 7 |
| 4.25 | 47.5 | L | 7.5 | 9.5 | 7.25 |
| 4.5 | 48 | I½ | 8 | 10 | 7.5 |
| 4.75 | 49 | J | 8.5 | 10.5 | 8 |
| 5 | 49.3 | J½ | 9 | 11 | 9 |
| 5.25 | 50.4 | K | 9.5 | 11.5 | 9.5 |
| 5.5 | 50.6 | K½ | 10 | 12 | 10.5 |
| 5.75 | 51 | L | 10.5 | 12.5 | 11 |
| 6 | 51.9 | L½ | 11 | 13 | 12.75 |
| 6.25 | 52 | M | 11.5 | 13.5 | 13 |
| 6.5 | 53.1 | M½ | 13 | 14.5 | 14 |
| 6.75 | 54 | N | 13.5 | 15 | 14.5 |
| 7 | 54.4 | N½ | 14 | 16 | 15.25 |
| 7.25 | 55 | O | 14.5 | 16.5 | 16 |
| 7.5 | 55.7 | O½ | 15 | 17 | 16.25 |
| 7.75 | 56 | P | 15.5 | 17.5 | 17 |
| 8 | 57 | P½ | 16 | 18 | 17.75 |
| 8.25 | 58 | Q | 16.5 | 18.5 | 18 |
| 8.5 | 58.3 | Q½ | 17 | 19 | 18.25 |
| 8.75 | 59 | R | 17.5 | 19.5 | 18.5 |
| 9 | 59.5 | R½ | 18 | 20.5 | 19 |
| 9.25 | 60 | S | 18.5 | 21 | 19.5 |
| 9.5 | 60.8 | S½ | 19 | 22 | 20 |
| 9.75 | 61 | T | 19.5 | 22.5 | 21 |
| Resizable | 46-67 | H-Y | 7-15 | 9-26 | 6-27 |
| 10 | 62.1 | T½ | 20 | 23 | 21.5 |
| 10.25 | 62.5 | U | 20.5 | 23.3 | 22 |
| 10.5 | 63 | U½ | 21 | 23.5 | 23 |
| 10.75 | 64 | V | 21.5 | 23.8 | 23.5 |
| 11 | 64.6 | V½ | 23 | 24 | 24 |
| 11.25 | 64.8 | W | 23.5 | 24.5 | 24.5 |
| 11.5 | 65 | W½ | 24 | 25 | 25 |
| 11.75 | 66 | Y | 24.5 | 25.5 | 26 |
| 12 | 67.2 | Y½ | 25 | 26 | 27.5 |
