this useful table below, shows all the imperial sizes with their metric equivalent. Some manufacturers (including Michelin) still use imperial sizing so it is imperative to ensure you get the correct size tyres for your agricultural machinery.
| IMPERIAL TYRE SIZE | EQUIVALENT METRIC TYRE SIZE |
|---|---|
| 11.2×20 | 280/85R20 |
| 12.4×20 | 320/85R20 |
| 9.5×24 | 250/85R24 |
| 11.2×24 | 280/85R24 |
| 12.4×24 | 320/85R24 |
| 13.6×24 | 340/85R24 |
| 14.9×24 | 380/85R24 |
| 16.9×24 | 420/85R24 |
| 18.4×26 | 420/85R26 |
| 11.2×28 | 280/85R28 |
| 12.4×28 | 320/85R28 |
| 13.6×28 | 340/85R28 |
| 14.9×28 | 380/85R28 |
| 16.9×28 | 420/85R28 |
| 14.9×30 | 380/85R30 |
| 16.9×30 | 420/85R30 OR 420/90R30 |
| 18.4×30 | 460/85R30 |
| 12.4×32 | 320/85R32 |
| 12.4×34 | 320/85R34 |
| 14.9×34 | 380/85R34 |
| 16.9×34 | 420/85R34 |
| 18.4×34 | 460/85R34 |
| 20.8×34 | 520/85R34 |
| 12.4×36 | 320/85R36 |
| 13.6×36 | 340/85R36 |
| 13.6×38 | 340/85R38 |
| 14.9×38 | 380/85R38 |
| 16.9×38 | 420/85R38 |
| 18.4×38 | 460/85R38 |
| 20.8×38 | 520/85R38 |
| 18.4×42 | 460/85R42 |
| 20.8×42 | 520/85R42 |
| 14.9×46 | 380/90R46 |
| 16.9×46 | 420/80R46 |
| 18.4×46 | 480/80R46 |
| 20.8×46 | 520/85R46 |
| 18.4×50 | 480/80R50 |
