Ring size
|
Inside Diameter
|
Outside Diameter | European size |
| 13.0 mm | 40.8 mm | 41 |
| 13.4 mm | 41.9 mm | 42 |
| 13.7 mm | 42.9 mm | 43 |
| 14.0 mm | 44 mm | 44 |
| 14.4 mm | 45 mm | 45 |
| 14.7 mm | 46.1 mm | 46 |
| 15.0 mm | 47.1 mm | 47 |
| 15.4 mm | 48.2 mm | 48 |
| 15.7 mm | 49.2 mm | 49 |
| 16.0 mm | 50.3 mm | 50 |
| 16.4 mm | 51.3 mm | 51 |
| 16.7 mm | 52.4 mm | 52 |
| 17.0 mm | 53.4 mm | 53 |
| 17.4 mm | 54.5 mm | 54 |
| 17.7 mm | 55.5 mm | 55 |
| 18.0 mm | 56.5 mm | 56 |
| 18.4 mm | 57.6 mm | 57 |
| 18.7 mm | 58.6 mm | 58 |
| 19.0 mm | 59.7 mm | 59 |
| 19.4 mm | 60.7 mm | 60 |
| 19.7 mm | 61.8 mm | 61 |
| 20.0 mm | 62.8 mm | 62 |
| 20.4 mm | 63.9 mm | 63 |
| 20.7 mm | 64.9 mm | 64 |
| 21.0 mm | 66.0 mm | 65 |
| 21.4 mm | 67.0 mm | 66 |
| 21.7 mm | 68.1 mm | 67 |
| 22.0 mm | 69.1 mm | 68 |
| 22.4 mm | 70.1 mm | 69 |
| 22.7 mm | 71.2 mm | 70 |