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| Inside Diameter (mm) | Inside Circumference (mm) | India | US / Canada | UK / Australia | Europe |
|---|---|---|---|---|---|
| 14.1 | 44.2 | 4 | 3 | F | 44 |
| 14.5 | 45.5 | 5 | 3.5 | G | 45.5 |
| 14.9 | 46.8 | 6 | 4 | H | 47 |
| 15.3 | 48.0 | 7 | 4.5 | I | 48 |
| 15.7 | 49.3 | 8 | 5 | J | 49 |
| 16.1 | 50.6 | 9 | 5.5 | K | 50.5 |
| 16.5 | 51.9 | 10 | 6 | L | 52 |
| 16.9 | 53.1 | 11 | 6.5 | M | 53 |
| 17.3 | 54.4 | 12 | 7 | N | 54.5 |
| 17.7 | 55.7 | 13 | 7.5 | O | 56 |
| 18.1 | 57.0 | 14 | 8 | P | 57 |
| 18.5 | 58.3 | 15 | 8.5 | Q | 58 |
| 18.9 | 59.5 | 16 | 9 | R | 59.5 |
| 19.3 | 60.8 | 17 | 9.5 | S | 61 |
| 19.7 | 62.1 | 18 | 10 | T | 62 |
| 20.1 | 63.4 | 19 | 10.5 | U | 63.5 |
| 20.6 | 64.6 | 20 | 11 | V | 65 |
| 21.0 | 65.9 | 21 | 11.5 | W | 66 |
| 21.4 | 67.2 | 22 | 12 | X | 67.5 |
| 21.8 | 68.5 | 23 | 12.5 | Y | 69 |
| 22.2 | 69.7 | 24 | 13 | Z | 70 |
| 22.6 | 71.0 | 25 | 13.5 | Z+1 | 71.5 |
| 23.0 | 72.3 | 26 | 14 | Z+2 | 73 |
| 23.4 | 73.6 | 27 | 14.5 | Z+3 | 74 |
| 23.8 | 74.8 | 28 | 15 | Z+4 | 75.5 |