Division 2.21.3.1 The values of the ‘d’ symbols expressed in millimetres are shown below:F1
| Nominal rim diameter code (d) | Value of the ‘d’ symbol expressed in mm |
|---|---|
| 8 9 10 11 12 13 14 | 203 229 254 279 305 330 356 |
| 15 16 17 18 19 | 381 406 432 457 483 |
| 20 21 | 508 533 |