| Inside Diameter (mm) | Inside Circumference (mm) | US/CA | UK/AU | France/Germany | EU |
|---|---|---|---|---|---|
| 14.9 | 46.8 | 4 | H | 46.5 | 6.75 |
| 15.3 | 48 | 4.5 | I | 47.75 | 8 |
| 15.7 | 49.3 | 5 | J-½ | 49 | 9.25 |
| 16.1 | 50.6 | 5.5 | K-½ | 50.25 | 10.5 |
| 16.5 | 51.9 | 6 | L-½ | 51.5 | 11.75 |
| 16.9 | 53.1 | 6.5 | M-½ | 52.75 | 13.25 |
| 17.3 | 54.4 | 7 | N-½ | 54 | 14.5 |
| 17.7 | 55.7 | 7.5 | O-½ | 55.25 | 15.75 |
| 18.1 | 57 | 8 | P-½ | 56.5 | 17 |
| 18.5 | 58.3 | 8.5 | Q-½ | 57.75 | 18.25 |
| 19.0 | 59.5 | 9 | R-½ | 59 | 19.5 |
| 19.4 | 60.8 | 9.5 | S-½ | 60.25 | 20.75 |
| 19.8 | 62.1 | 10 | T-½ | 61.5 | 22 |
| 20.2 | 63.4 | 10.5 | U-½ | 62.75 | 23.25 |
| 20.6 | 64.6 | 11 | V-½ | 64 | 24.5 |
| 21.0 | 65.9 | 11.5 | W-½ | 65.25 | 25.75 |
| 21.4 | 67.2 | 12 | X-½ | 66.5 | 27 |
