| Internal Diameter (mm) | US | UK | Europe |
| 15 | 4 | H - I | 47 |
| 15.75 | 5 | J - K | 50 |
| 16.5 | 6 | L - M | 52 |
| 17.5 | 7 | N - O | 55 |
| 18 | 8 | P - Q | 57 |
| 19 | 9 | R - S | 60 |
| 20 | 10 | T - U | 62 |
| 21 | 11 | V - W | 64 |
| 21.5 | 12 | Y - Z | 67.5 |
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