| Inside Diameter (MM) | Inside Circum. (MM) | US & CA |
|---|---|---|
| 14.88 | 46.8 | 4 |
| 15.09 | 47.4 | 4¼ |
| 15.49 | 48.7 | 4¾ |
| 15.7 | 49.3 | 5 |
| 15.9 | 50 | 5¼ |
| 16.31 | 51.2 | 5¾ |
| 16.51 | 51.9 | 6 |
| 16.71 | 52.5 | 6¼ |
| 17.12 | 53.8 | 6¾ |
| 17.32 | 54.4 | 7 |
| 17.53 | 55.1 | 7¼ |
| 17.93 | 56.3 | 7¾ |
| 18.14 | 57 | 8 |
| 18.34 | 57.6 | 8¼ |
| 18.75 | 58.9 | 8¾ |
| 18.95 | 59.5 | 9 |
| 19.15 | 60.2 | 9¼ |
| 19.56 | 61.4 | 9¾ |
| 19.76 | 62.1 | 10 |
| 20.57 | 64.6 | 11 |
| 21.39 | 67.2 | 12 |